Mentally Add and Subtract 10 & 100

Front

71 - 10 = ?

Back

61

Front

342 - 10 = ?

Back

332

Front

95 + 10 = ?

Back

105

Front

682 + 10 = ?

Back

692

Front

222 + 100 = ?

Back

322

Front

What is the result of adding 10 to a number?

Back

You increase the number by 10.

Front

What is the result of subtracting 10 from a number?

Back

You decrease the number by 10.

Front

What happens when you add 100 to a number?

Back

You increase the number by 100.

Front

What happens when you subtract 100 from a number?

Back

You decrease the number by 100.

Front

If you have 50 and add 10, what do you get?

Back

60