Number Stories

Select the missing factor in each equation.

5 + 8 + ___ = 20

• 5

• 6

• 7

• 8

Select the missing factor in each equation.

10 + ___ - 11 = 4

• 4

• 5

• 6

• 7

Select the missing factor in each equation.

20 + 3 - 5 - ___ = 12

• 4

• 5

• 6

• 7

Select the missing factor in each equation.

2 + 5 +___ - 5 = 11

• 9

• 10

• 11

• 12

Select the missing factor in each equation.

___ + 17 + 2 - 20 = 5

• 3

• 4

• 5

• 6

Select the equivalent expressions.

24 - 4 - 6 =

• 7 + 7 =
  

• 4 + 2 + 10 =
  

• 5 + 10 =
  

• 6 + 8 - 1 =
  

Select the equivalent expressions.

8 - 6 + 9 =

• 14 - 3 - 2 =
  

• 9 - 2 + 5 =
  

• 12 - 1 =
  

• 20 - 3 - 7 =
  

Select the equivalent expressions.

12 + 9 + 3 - 6 =

• 7 + 7 - 1 =
  

• 15 - 4 + 6 =
  

• 20 - 3 =
  

• 18 + 2 + 1 - 3 =
  

Select the equivalent expressions.

19 - 7 - 11 + 14 =

• 7 + 7 + 1 =
  

• 11 - 4 + 6 =
  

• 12 - 3 - 2 =
  

• 9 + 9 - 2 =
  

Select the equivalent expressions.

3 + 4 + 7 + 5 - 9 =

• 11 + 9 - 12 =
  

• 15 - 4 + 3 =
  

• 10 - 5 + 4 + 1 =
  

• 12 + 9 - 2 =