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MR 2.2
Make precise
calculations and check the validity of the results in
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the context of the problem.
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UNDERLYING SKILLS AND CONCEPTS:
basic addition facts
Problem Solving: Logical Reasoning:
What’s My Number?
a
K
ey Ide
When you solve problems, use the 4-step
Problem-Solving Plan. When you get to
Step 3, try using logical reasoning to solve.
E x am p l E
B – © CSL Associates, Inc. All rights reserved.
Lisa added 4 to a number and got a sum of 12.
What number did she add 4 to?
1. What do you need to
find out?
What number Lisa added.
2. What information can
you use to answer the
question?
She started with a number and added 4
to it.
She got a sum of 12.
3. How can you solve
the problem?
Try using logical reasoning to solve.
What number plus 4 is 12? 8
4. How can you check
your answer?
Put your answer in the original problem.
8 + 4 = 12, so the answer checks.
Chapter 7 – Lesson 3
page 79
Name
P RAC T I C E
Solve. Show how you found your answer.
A number plus 4 is 9.
What is the number?
2
5
3
Ryan added a number to
itself and got a sum of 10.
What number did he add?
4
4
5
5
Ally wrote a number on her
paper. The number has 2
digits. It is the sum of 9 and
3. What number did she
write?
12
Math
Reasoning
7
When you add 6 to this
number you get 10. What is
the number?
I am thinking of a number.
When you add 4 to my
number you get 11. What is
my number?
7
6
Harley picked a number out
of hat for a prize. He picked
a number that is more than 7
and less than 10. It is an odd
number. What number did
he pick?
9
Problem Solving
MR 2.3
I am thinking of a number.
When I add 5 to it, I get 3 more than when I add 6 + 4.
What is my number?
8
page 80
Chapter 7 – Lesson 3
B – © CSL Associates, Inc. All rights reserved.
1
Name
P RAC T I C E
Solve. Show how you found your answer.
A number plus 3 is 7.
What is the number?
2
When you add 6 to this
number you get 15. What is
the number?
4
3
9
Jerome added a number to
itself and got a sum of 12.
What number did he add?
4
I am thinking of a number.
When you add 5 to my
number you get 11. What is
my number?
6
5
6
Vera wrote a number on her
paper. The number has 2
digits. It is the sum of 11 and
12. What number did she
write?
6
Charley picked a number out
of hat for a prize. He picked
a number that is more than 5
and less than 9. It is an odd
number. What number did
he pick?
23
Math
Reasoning
7
7
Problem Solving
MR 2.3
I am thinking of a number.
When I add 6 to it, I get 4 more than when I add 7 + 4.
What is my number?
9
page 54
Home Resource and Homework
Chapter 7 Lesson 3
B – © CSL Associates, Inc. All rights reserved.
1
MCX94TEG2Ch01_30.v9.4.1 2/19/01 19:46 Page 147
Name
P RAC T I C E
Solve. Show how you found your answer.
1
A number plus 4 is 9.
What is the number?
2
When you add 6 to this
number you get 10. What is
the number?
5
3
4
Ryan added a number to
itself and got a sum of 10.
What number did he add?
4
I am thinking of a number.
When you add 4 to my
number you get 11. What is
my number?
5
B – © CSL Associates, Inc. All rights reserved.
5
7
Ally wrote a number on her
paper. The number has 2
digits. It is the sum of 9 and
3. What number did she
write?
6
Harley picked a number out
of hat for a prize. He picked
a number that is more than 7
and less than 10. It is an odd
number. What number did
he pick?
12
Math
Reasoning
7
9
Problem Solving
MR 2.3
I am thinking of a number.
When I add 5 to it, I get 3 more than when I add 6 + 4.
What is my number?
8
Chapter 7 – Lesson 3
Student Book Page
page 80
Name
P RAC T I C E
Solve. Show how you found your answer.
A number plus 3 is 7.
What is the number?
2
When you add 6 to this
number you get 15. What is
the number?
4
3
9
Jerome added a number to
itself and got a sum of 12.
What number did he add?
4
I am thinking of a number.
When you add 5 to my
number you get 11. What is
my number?
6
5
6
Vera wrote a number on her
paper. The number has 2
digits. It is the sum of 11 and
12. What number did she
write?
6
Charley picked a number out
of hat for a prize. He picked
a number that is more than 5
and less than 9. It is an odd
number. What number did
he pick?
23
Math
Reasoning
7
7
Problem Solving
MR 2.3
I am thinking of a number.
When I add 6 to it, I get 4 more than when I add 7 + 4.
What is my number?
9
page 54
Home Resource and Homework
Chapter 7 Lesson 3
B – © CSL Associates, Inc. All rights reserved.
1