Finding Missing Addends

Front

Definition of addend

Back

A number added to another in an addition equation

Front

Equation format

Back

a + b = c

Front

Missing addend example

Back

5 + _ = 9

Front

Solving for missing addend

Back

Subtract known addend from sum

Front

Example solution

Back

9 - 5 = 4

Front

Missing addend in 7 + _ = 12

Back

12 - 7 = 5

Front

Reverse operation

Back

Subtraction to find missing addend

Front

x + 3 = 10, find x

Back

x = 10 - 3 = 7

Front

8 + _ = 15

Back

15 - 8 = 7

Front

Concept of balance

Back

Both sides of equation equal