Wednesday, August 19, 2015 We are learning to…add and subtract positive and negative integers with Algebra Tiles.

Wednesday, April 19, 2023

We are learning to…add and subtract positive and negative integers with Algebra Tiles.

Subtraction means …to take away, so to show this with chips we will have to…start with a certain amount of chips and then take away from that group.

9 5 _______ 8 ( 3) _______ 7 ( 6) _______ 4 -5 -1

Now try:

4 ( 2) _______ PROBLEM ?

14 ( 8) _______ 9 ( 9) _______ 15 ( 8) _______ -6 0 -7

Solution:◦ Add in “Zero Pairs” until you have enough negative (or positives)

to take away!

◦ A Zero Pair is a positive and a negative Algebra Tile.

◦ Since the two chips cancel each other, you are really adding in zero and not changing the problem.

Remember:+ = 0

4 ( 2) _______ 6

5 ( 4) _______ 7 ( 2) _______ 8 3 _______

9 5 _______ 2 10 _______ 1 ( 4) _______

9 -11 9

-14 -8 3

Now try a few assessment questions to test your skills adding and

subtraction integers!

7-3

7+3

-7+(

-3)

-7-(-

3)

I nee

d hel

p wi..

.

0 0 000

A. 7-3B. 7+3C. -7+(-3)D. -7-(-3)E. I need help with this question.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

3-1

1 11 -3

I nee

d hel

p wi..

.

0 0 000

A. 3B. -11C. 11D. -3E. I need help with

this question.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

-10 10 -2 2

I nee

d hel

p wi..

.

0 0 000

A. -10B. 10C. -2D. 2E. I need help with

this question.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24

8 2 -2 -8

I nee

d hel

p wi..

.

0 0 000

A. 8B. 2C. -2D. -8E. I need help with

this question.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24