Mental Math

Which number sentence is wrong?

• 8 + 5 = 13

• 13 - 5 = 8

• 5 + 8 = 13

• 8 - 5 = 13

____ - 9 = 6

• 13

• 14

• 15

• 16

What needs to be added to 4 to make 10?

• 2

• 6

• 4

• 3

12 + 5

• 16

• 17

• 18

Choose the doubles fact that answers this equations

8 + 9 = 17

• 8 + 8 + 1

• 9 + 9 + 1

Select two numbers that have a sum of a multiple of ten.

• 6

• 8

• 3

• 7

• 5

10 + 8 =

• 14

• 18

• 16

• 81

6 + _____ = 11

• 5

• 4

• 6

• 11

Sara has 19 balloons. 8 balloons are red and the rest of them are green. How many green balloons does she have?

• 12

• 11

• 9

• 13

A bee has 6 legs. How many legs do 5 bees have?

• 30

• 50

• 55

• 60