Facts with unknowns

Front

What is the unknown number? 5 + ___ = 7

Back

2

Front

What is the unknown number? 2 + ___ = 4

Back

2

Front

What is the unknown number? 7 + ___ = 9

Back

2

Front

What is the unknown number? 3 + ___ = 7

Back

4

Front

What is the unknown number? 8 + ___ = 8

Back

0

Front

What do we call a number that we don't know yet?

Back

Unknown number

Front

What is the result of adding 0 to any number?

Back

The same number.

Front

If you have 3 apples and you add 2 more, how many do you have?

Back

5

Front

What is 1 + ___ = 3?

Back

2

Front

What is 4 + ___ = 6?

Back

2