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Add or Subtract 10 and 100 Mentally — Work It Out

Only one digit changes. Do it in your head.

Example184 − 10 = 174
  1. 1.119 − 10 =
  2. 2.662 + 100 =
  3. 3.712 + 10 =
  4. 4.541 + 10 =
  5. 5.531 + 100 =
  6. 6.432 + 100 =
  7. 7.467 − 10 =
  8. 8.140 − 100 =
  9. 9.640 + 100 =
  10. 10.777 − 100 =
  11. 11.630 + 10 =
  12. 12.313 − 10 =
  13. 13.264 + 100 =
  14. 14.261 − 100 =