Adding and Subtracting Rational Numbers

When adding rational numbers with the same sign, you must:

• Subtract and keep the sign of the biggest number

• Add together and keep the sign

• Keep, change, switch

• Add the opposite

Rewrite the problem as addition.

-5.66 - (-4.1)

• 5.66 + (-4.1)

• -5.66 + 4.1

• -5.66 + (-4.1)

• -5.66 - 4.1

• 14/15

• -2/15

• 2/15

• -14/15

Jilian borrowed $15 from her dad. She then babysat and earned $12. She gave her dad that money. How much does she still owe her dad?

• $3

• 17

• $12

• $15

-51 + 81.623

• 30.623

• -30.623

• 132.623

• -132.623

Mr. Smith has an account balance of -$275.78. He deposits $139.20 into his account. What is Mr. Smith's account balance now?

• $-414.98

• $-136.58

• $136.58

• $414.98

- 5.62 + (- 12.9)

• -6.91

• - 18.52

• 6.28

• 6.91

-14 + 9 + 13

• 8

• 33

• -9

• -33

-40 + 15.05= 

• 55.05

• 24.95

• -24.95

• 14.65

-51 + 81.623

• 30.623

• -30.623

• 132.623

• -132.623