Smart Subtract
Mastering differences of 10
Think smart
Foundational
Use the fingers to help you find the missing numbers.
Lots of practice makes you smart, counting down is where you start!
1
2
10 - 2 = 8
10 - 7 =
What is 10 minus 2 fingers?
What is 10 minus 7 fingers?
4
3
10 - 5 =
10 - 1 =
What is 10 minus 5 fingers?
What is 10 minus 1 fingers?
5
6
10 - 9 =
10 - 4 =
What is 10 minus 9 fingers?
What is 10 minus 4 fingers?
Copyright © 2010 Greg Tang Math, LLC
www.GregTangMath.com
Smart Subtract
Mastering differences of 10
Think smart
Foundational
Use the fingers to help you find the missing numbers.
Lots of practice makes you smart, counting down is where you start!
1
2
10 - 10 =
10 - 3 = 7
What is 10 minus 10 fingers?
What is 10 minus 3 fingers?
4
3
10 - 6 =
10 - 8 =
What is 10 minus 6 fingers?
What is 10 minus 8 fingers?
5
6
10 - 9 =
10 - 4 =
What is 10 minus 9 fingers?
What is 10 minus 4 fingers?
Copyright © 2010 Greg Tang Math, LLC
www.GregTangMath.com
Smart Subtract
Mastering differences of 10
Think smart
Foundational
Use the fingers to help you find the missing numbers.
Lots of practice makes you smart, counting down is where you start!
1
2
10 - 7 = 3
10 - 2 =
What is 10 minus 7 fingers?
What is 10 minus 2 fingers?
4
3
10 - 5 =
10 - 1 =
What is 10 minus 5 fingers?
What is 10 minus 1 fingers?
5
6
10 - 8 =
10 - 6 =
What is 10 minus 8 fingers?
What is 10 minus 6 fingers?
Copyright © 2010 Greg Tang Math, LLC
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
11 - 7 =
14 - 8 =
4
1
6
4
Make 10
Subtract
the rest
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
This problem can be quickly done.
Start by first subtracting 1!
4
3
12 - 5 =
15 - 6 =
3
5
Make 10
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer’s easy to derive,
if you first subtract a 5!
5
Subtract
the rest
6
13 - 8 =
12 - 4 =
5
Make 10
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
11 - 6 =
13 - 9 =
5
1
5
3
Make 10
Subtract
the rest
Make 10
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
This problem can be quickly done.
Start by first subtracting 1!
4
3
14 - 7 =
17 - 8 =
3
7
Make 10
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
Ten is better than eleven.
Start subtracting with a 7!
5
Subtract
the rest
6
13 - 5 =
11 - 2 =
2
Make 10
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
11 - 3 =
11 - 5 =
8
1
2
1
Make 10
Subtract
the rest
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
This problem can be quickly done.
Start by first subtracting 1!
4
3
12 - 7 =
13 - 4 =
5
3
Make 10
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer will be quick to see
if you first subtract a 3!
5
Subtract
the rest
6
15 - 8 =
12 - 8 =
3
Make 10
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
16 - 8 =
12 - 3 =
8
6
2
2
Make 10
Subtract
the rest
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
This problem has an easy fix.
Simply first subtract a 6!
4
3
11 - 8 =
15 - 9 =
7
5
Make 10
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
The answer’s easy to derive,
if you first subtract a 5!
5
Subtract
the rest
6
11 - 4 =
17 - 9 =
3
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
Ten is better than eleven.
Start subtracting with a 7!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
15 - 7 =
14 - 9 =
8
5
2
4
Make 10
Subtract
the rest
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
The answer’s easy to derive,
if you first subtract a 5!
4
3
16 - 7 =
13 - 6 =
1
3
Make 10
Make 10
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
The answer will be quick to see
if you first subtract a 3!
5
Subtract
the rest
6
12 - 9 =
12 - 6 =
7
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
16 - 9 =
14 - 6 =
7
6
3
4
Make 10
Subtract
the rest
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
This problem has an easy fix.
Simply first subtract a 6!
4
3
14 - 5 =
13 - 7 =
1
3
Make 10
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
The answer will be quick to see
if you first subtract a 3!
5
Subtract
the rest
6
18 - 9 =
11 - 9 =
1
Make 10
Subtract
the rest
A strategy that’s really great
is first to take away an 8!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
15 - 6 =
12 - 4 =
9
5
1
2
Make 10
Subtract
the rest
Make 10
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer’s easy to derive,
if you first subtract a 5!
4
3
15 - 8 =
12 - 7 =
3
2
Make 10
Make 10
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
Subtracting will be quick to do.
First just take away a 2!
5
Subtract
the rest
6
13 - 9 =
11 - 5 =
6
Make 10
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
www.GregTangMath.com
Smart Subtract
Intermediate
The Make 10 Subtraction Strategy
Think smart
Find the missing numbers by first making 10,
then subtracting the rest. Don’t count down!
1
2
13 - 5 =
13 - 6 =
8
3
2
3
Make 10
Subtract
the rest
Make 10
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
The answer will be quick to see
if you first subtract a 3!
4
3
14 - 9 =
18 - 9 =
5
8
Make 10
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
A strategy that’s really great
is first to take away an 8!
5
Subtract
the rest
6
11 - 7 =
14 - 8 =
6
Make 10
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Copyright © 2010 Greg Tang Math, LLC
Make 10
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
33 - 6 =
84 - 8 = 76
4
4
3
Make 80
Subtract
the rest
Make 30
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
Thinking smart is nothing more
than simply first subtracting 4!
4
3
42 - 8 =
27 - 9 =
6
7
Make 20
Make 40
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Ten is better than eleven.
Start subtracting with a 7!
5
Subtract
the rest
6
52 - 3 =
63 - 5 =
1
Make 50
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Copyright © 2010 Greg Tang Math, LLC
Make 60
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
91 - 9 =
25 - 8 = 17
5
3
1
Make 20
Subtract
the rest
Make 90
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
The answer’s easy to derive,
if you first subtract a 5!
4
3
52 - 7 =
45 - 9 =
5
5
Make 40
Make 50
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer’s easy to derive,
if you first subtract a 5!
5
Subtract
the rest
6
86 - 7 =
36 - 8 =
1
Make 80
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
Copyright © 2010 Greg Tang Math, LLC
Make 30
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
21 - 5 =
73 - 8 = 65
3
5
1
Make 70
Subtract
the rest
Make 20
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
The answer will be quick to see
if you first subtract a 3!
4
3
61 - 3 =
44 - 7 =
2
4
Make 40
Make 60
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Thinking smart is nothing more
than simply first subtracting 4!
5
Subtract
the rest
6
82 - 9 =
55 - 6 =
7
Make 80
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Copyright © 2010 Greg Tang Math, LLC
Make 50
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
82 - 5 =
35 - 7 = 28
5
2
2
Make 30
Subtract
the rest
Make 80
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer’s easy to derive,
if you first subtract a 5!
4
3
63 - 4 =
91 - 2 =
1
1
Make 90
Make 60
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
This problem can be quickly done.
Start by first subtracting 1!
5
Subtract
the rest
6
54 - 9 =
73 - 7 =
5
Make 50
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
Copyright © 2010 Greg Tang Math, LLC
Make 70
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
52 - 6 =
43 - 9 = 34
3
6
2
Make 40
Subtract
the rest
Make 50
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
The answer will be quick to see
if you first subtract a 3!
4
3
32 - 4 =
74 - 5 =
2
4
Make 70
Make 30
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Thinking smart is nothing more
than simply first subtracting 4!
5
Subtract
the rest
6
21 - 4 =
87 - 8 =
3
Make 20
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Copyright © 2010 Greg Tang Math, LLC
Make 80
Subtract
the rest
Ten is better than eleven.
Start subtracting with a 7!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
91 - 6 =
98 - 9 = 89
8
1
1
Make 90
Subtract
the rest
Make 90
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
A strategy that’s really great
is first to take away an 8!
4
3
36 - 9 =
41 - 7 =
3
1
Make 40
Make 30
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
This problem can be quickly done.
Start by first subtracting 1!
5
Subtract
the rest
6
61 - 8 =
74 - 6 =
7
Make 60
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Copyright © 2010 Greg Tang Math, LLC
Make 70
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
62 - 8 =
82 - 7 = 75
2
5
2
Make 80
Subtract
the rest
Make 60
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Subtracting will be quick to do.
First just take away a 2!
4
3
96 - 8 =
34 - 5 =
2
4
Make 30
Make 90
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
Thinking smart is nothing more
than simply first subtracting 4!
5
Subtract
the rest
6
53 - 6 =
72 - 9 =
3
Make 50
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
Copyright © 2010 Greg Tang Math, LLC
Make 70
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
96 - 9 =
23 - 7 = 16
3
4
6
Make 20
Subtract
the rest
Make 90
Subtract
the rest
This problem has an easy fix.
Simply first subtract a 6!
The answer will be quick to see
if you first subtract a 3!
4
3
63 - 8 =
51 - 9 =
5
1
Make 50
Make 60
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
This problem can be quickly done.
Start by first subtracting 1!
5
Subtract
the rest
6
45 - 6 =
85 - 7 =
1
Make 40
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
Copyright © 2010 Greg Tang Math, LLC
Make 80
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
84 - 6 =
51 - 8 = 43
1
7
4
Make 50
Subtract
the rest
Make 80
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
This problem can be quickly done.
Start by first subtracting 1!
4
3
32 - 3 =
44 - 9 =
1
4
Make 40
Make 30
Subtract
the rest
Subtracting will be quick to do.
First just take away a 2!
Thinking smart is nothing more
than simply first subtracting 4!
5
Subtract
the rest
6
24 - 7 =
71 - 5 =
3
Make 20
Subtract
the rest
Thinking smart is nothing more
than simply first subtracting 4!
Copyright © 2010 Greg Tang Math, LLC
Make 70
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
www.GregTangMath.com
Smart Subtract
Advanced
The Make 10s Subtraction Strategy
Think smart
Find the missing numbers by first making a multiple of 10,
then subtracting the rest. Don’t count down!
1
2
61 - 2 =
34 - 8 = 26
4
4
1
Make 30
Subtract
the rest
Make 60
Subtract
the rest
This problem can be quickly done.
Start by first subtracting 1!
Thinking smart is nothing more
than simply first subtracting 4!
4
3
23 - 5 =
83 - 9 =
2
3
Make 80
Make 20
Subtract
the rest
The answer will be quick to see
if you first subtract a 3!
The answer will be quick to see
if you first subtract a 3!
5
Subtract
the rest
6
55 - 6 =
75 - 8 =
1
Make 50
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
Copyright © 2010 Greg Tang Math, LLC
Make 70
Subtract
the rest
The answer’s easy to derive,
if you first subtract a 5!
www.GregTangMath.com