Mentally Add and Subtract 10 or 100

Front

What is 10 more than 89?

Back

99

Front

What is 10 less than 176?

Back

166

Front

What is 100 less than 789?

Back

689

Front

What is 10 more than 56?

Back

66

Front

What is 100 less than 287?

Back

187

Front

If you add 10 to 50, what do you get?

Back

60

Front

If you subtract 10 from 90, what do you get?

Back

80

Front

If you add 100 to 200, what do you get?

Back

300

Front

If you subtract 100 from 500, what do you get?

Back

400

Front

What is 10 more than 34?

Back

44