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Algebra tiles can be used to add or subtract integers.

Remember integers are

.

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Example 1:

Use algebra tiles to represent

=

=

Use algebra tiles to represent

=

=

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Neutral pairs have a value of _.

zero

=

0

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Example 2:

A. Use algebra tiles to represent

and then cross out any neutral pairs.

+

= =

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B. Use algebra tiles to represent

and then cross out any neutral pairs.

=

=

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C. Use algebra tiles to represent

and then cross out any neutral pairs.

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D. Use algebra tiles to represent

and then cross out any neutral pairs.

=

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E. Use algebra tiles to represent

and then cross out any neutral pairs.

There are no

neutral pairs

=

1

2

3

4

5

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F. Use algebra tiles to represent

and then cross out any neutral pairs.

There are no

neutral pairs

=

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A. Signs are the same –

2.

Add the numbers

Take the given sign

B. Signs are the different –

2.

Subtract the numbers

Take the sign of the larger number

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Slide 12

Example 3: Find each sum.

A.

B.

C.

Signs are

the same

Signs are

different

Signs are

different

Try these… Find each sum.

A.

B.

C.

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Slide 13

Example 4: Find each sum.

A.

B.

C.

D.

1.2

-12.3

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