Operations with Signed Numbers

Choose all negative signed numbers:

• -2

• 1.5

• +3.15

• -2.4

• 0

Choose all positive signed numbers:

• -2

• 1.5

• +3.15

• -2.4

• 0

-13 - (- 12)

• -1

• 1

• 25

• -25

When you add integers with the same sign...

• you always get a positive

• you always get a negative

• you add and keep the sign

• you subtract and take the sign of the larger number

• you keep, change, change

23 - 47 + 18 - (-12) =

• 6

• -18

• 56

When adding numbers with the same sign, I __________ the numbers.

• add

• subtract

When adding numbers with different signs, I ___________ the numbers.

• add

• subtract

5 - 7

• -2

• 12

• 2

• -12

-9  +  6

• 15

• -3

• -15

• 3

15 + (- 9)

• 24

• 6

• -6

• -24