I know when I subtract 100 from a number the
hundreds digit decreases by 1. What if I subtract
more than one hundred?
800 - 100 - 200 = ?
-200
0
100 200
300 400 500 600 700
-100
800 900 1,000
In this lesson you will learn to
subtract multiples of 100 from a
number by using a number line.
Let’s Review
Subtract 100
435 - 100
435 = 4 hundreds + 3 tens + 5 ones
435 - 100 =3 hundreds + 3 tens + 5 ones
435 - 100 = 335
Let’s Review
Skip count by 100s
-100
100
200
300
400
500
600
700
The The
tenshundreds
andare
ones digits
We
digit
decreases
are
both
zero.100.
They
subtracting
doby
notone.
change.
Core Lesson
-100
-100
-100
-100
Subtracting 100
400
500
600
700
800
800
800
800
800
-
100
200
300
400
=
=
=
=
700
600
500
400
Subtract
100,
What
if I subtract
the
hundreds
digit
a multiple
of 100?
decreases by 1.
Core Lesson
-100
-100
-100
-100
Subtracting 100
450
550
650
750
850
850
850
850
850
-
100
200
300
400
=
=
=
=
750
650
550
450
Do you notice that
the 50 in each
number stays the
same?
Core Lesson
800 - 200 = 600
Mrs. Lipp has 800 blue color tiles. She
gave 200 of them to Mr. Clark’s class. How
many does she have now?
Only
the hundreds
I know
8-2 = 6
digit changes.
-200
600
800
Core Lesson
600 - 200 = 400
Mrs. Lipp took 200 tiles home for her
son to play with? How many tiles
does she have now?
ISo
can
farthink
she
6
2.
has 600.
-200
400
-200
600
800
Core Lesson
875 -300 = 575
Kari had her game marker on 875. She
turned over this card.
-300
What number did she end up on?
-100 -100 -100
575 675 775 875
Core Lesson
875 -300 = 575
Kari had her game marker on 875. She
turned over this card.
-300
What number did she end up on?
8 hundreds minus 3
hundreds is 5
hundreds.
-300
575
875
Core Lesson
625 -400 = 225
The cooks at the school made 625
sandwiches for lunch. Students ate
400 of the sandwiches. How many
sandwiches were left?
-400
225
The tens digit
I can
and think
ones about
digit
6-4.same..
stay the
625
In this lesson you learned to
subtract multiples of 100 from
a number
by using a number line.