Created by V. S. BellH. H. Beam Elementary School

Gastonia, NC 28052

Let’s subtract!

Subtract means to take away!

•Use the EOG grid paper for student work.

•Ask students to practice along with the PowerPoint.

•Give students the quiz problem at the end for assessment. Then, show the correct work.

Let’s subtract!

Subtract means to take away!

•How many more?•How many left?•Difference?•Have left?

Let’s subtract!

Subtract means to take away!

X= 10 Tens Row= 1 Ones Row

= 100 Hundreds Row

Remember:

Largest number goes first!

Problem #1

500 - 137 = n

500

-137

Step #1. Show how many you have in the beginning.

500 - 137 = n

500 X X X X X H

T

O

Step #2. Subtract the number of hundreds.

500 - 137 = n

1 X X X X X H

T

O

Step #2. Subtract the number of hundreds.

500 - 137 = n

1 X X X X X H

T

O

Step #3a: Subtract the number of tens.

500 - 137 = n

3 X X X X X H

T

O

Step #3b: Are there any tens showing?

500 - 137 = n

X X X X XNO! Please regroup!

H

T

O

Step #3c: Circle one hundred and

draw marks for 10 tens?

500 - 137 = n

X X X X XX H

T

O

Step #3d: Mark out the number of tens?

500 - 137 = n

3X X X X XX H

T

O

Step #4a: Subtract the number of ones?

500 - 137 = n

7 X X X X XX H

T

O

Step #4b: Are there any ones showing?

500 - 137 = n

X X X X XX H

T

ONO! Please regroup!

Step #4c: Circle 1 ten and make marks

for 10 ones.

500 - 137 = n

X X X X XX H

T

O

Step #4d: Mark out the number of ones.

500 - 137 = n

7

X X X X XX H

T

O

Step #5: How many hundreds

do you have left?.

500 - 137 =

X X X X XX3

3

H

T

O

Step #6: How many tens

do you have left?.

500 - 137 =

X X X X XX6

36

H

T

O

Step #7: How many ones

do you have left?.

500 - 137 =

X X X X XX

3

36 3

H

T

O

Congratulations! You have subtracted across zeroes with regrouping!

500

- 137

X X X X XX

36 3

H

T

O

Problem #2

700 - 246 = n

700

-246

Step #1. Show how many you have in the beginning.

700 X X X X X H

T

O

700 - 246 = n

X X

Step #2. Subtract the number of hundreds.

X X X X X H

T

O

2

700 - 246 = n

X X

Step #3a: Subtract the number of tens.

4 X X X X X H

T

O

700 - 246 = n

X X

Step #3b: Are there any tens showing?

X X X X XNO! Please regroup!

H

T

O

700 - 246 = n

X X

Step #3c: Circle one hundred and

draw marks for 10 tens?X X X XX H

T

O

X X

700 - 246 = n

X

Step #3d: Mark out the number of tens?

4X X X XX H

T

O

700 - 246 = n

X X X

Step #4a: Subtract the number of ones?

6 X XX X X H

T

O

700 - 246 = n

X

Step #4b: Are there any ones showing?

X X X

NO! Please regroup!

H

T

O

X XX

700 - 246 = n

Step #4c: Circle 1 ten and make marks

for 10 ones.X X X X H

T

O

XX

700 - 246 = n

Step #4d: Mark out the number of ones.

6

X X X X H

T

O

700 - 246 = n

XX

Step #5: How many hundreds

do you have left?.X X X4

4

H

T

O

700 - 246 =

X XX

Step #6: How many tens

do you have left?.X X X

5

35

H

T

O

700 - 246 =

X XX

Step #7: How many ones

do you have left?.X X X X X

4

45 4

H

T

O

XX

700 - 246 =

X X X X X

4 54

H

T

O

XX

Congratulations! You have subtracted across zeroes with regrouping!

700

- 246

Time for a Quiz

600-333 = n

600

-333

To Be Continued . . .