Adding and Subtracting Tens

Front

What is adding tens?

Back

Adding tens means increasing a number by a multiple of ten. For example, if you add 20 to 30, you get 50.

Front

What is subtracting tens?

Back

Subtracting tens means decreasing a number by a multiple of ten. For example, if you subtract 10 from 50, you get 40.

Front

What is the result of 30 + 20?

Back

The result is 50.

Front

What is the result of 50 - 30?

Back

The result is 20.

Front

If you have 40 and you add 30, what do you get?

Back

You get 70.

Front

If you have 80 and you subtract 20, what do you get?

Back

You get 60.

Front

What does it mean to add 10?

Back

Adding 10 means to increase a number by 10. For example, 5 + 10 = 15.

Front

What does it mean to subtract 10?

Back

Subtracting 10 means to decrease a number by 10. For example, 15 - 10 = 5.

Front

What is 70 + 10?

Back

The answer is 80.

Front

What is 90 - 10?

Back

The answer is 80.