Adding and subtracting rational numbers (no calculator)

-40 + 15.05=

• 55.05

• 24.95

• -24.95

• -14.65

• -25.95

41 - 15 + (-29) =

• 85
• 3
• - 3
• 0

−28 + (−8)=

• 36

• −36

• −20

• 20

• 2 1/2

• 3 1/4

• 3

• -3

-6.5 + (-0.5) 

• -7
• 7
• 6
• -6

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

 ¼ − (-¾)

• -1/2
• 4/0
• 1
• None of the above

Add      0.5 + 0.25

• 0.75

• 1.25

• - 0.75

• 12.5

0.01 + 0.01

• 0.02

• 0.2

• - 0.02

Answer explanation

Different signs, Subtract.  Keep the sign of the greater number.