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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 738 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.249 + 27 =
  2. 2.140 + 18 =
  3. 3.365 + 89 =
  4. 4.485 + 89 =
  5. 5.376 + 27 =
  6. 6.395 + 67 =
  7. 7.287 + 88 =
  8. 8.405 + 38 =
  9. 9.472 + 77 =
  10. 10.474 + 19 =
  11. 11.38 + 19 =
  12. 12.321 + 58 =
  13. 13.57 + 19 =
  14. 14.134 + 78 =
  15. 15.121 + 99 =
  16. 16.262 + 68 =
  17. 17.274 + 29 =
  18. 18.286 + 38 =
  19. 19.202 + 78 =
  20. 20.242 + 98 =
  21. 21.176 + 17 =
  22. 22.220 + 59 =
  23. 23.167 + 97 =
  24. 24.147 + 99 =
  25. 25.138 + 38 =
  26. 26.213 + 27 =
  27. 27.173 + 67 =
  28. 28.70 + 18 =
  29. 29.258 + 59 =
  30. 30.423 + 49 =
  31. 31.91 + 47 =
  32. 32.115 + 18 =
  33. 33.70 + 17 =
  34. 34.169 + 39 =
  35. 35.142 + 39 =
  36. 36.144 + 49 =
  37. 37.418 + 39 =
  38. 38.270 + 79 =
  39. 39.382 + 28 =
  40. 40.71 + 57 =

Answer key

  1. 276
  2. 158
  3. 454
  4. 574
  5. 403
  6. 462
  7. 375
  8. 443
  9. 549
  10. 493
  11. 57
  12. 379
  13. 76
  14. 212
  15. 220
  16. 330
  17. 303
  18. 324
  19. 280
  20. 340
  21. 193
  22. 279
  23. 264
  24. 246
  25. 176
  26. 240
  27. 240
  28. 88
  29. 317
  30. 472
  31. 138
  32. 133
  33. 87
  34. 208
  35. 181
  36. 193
  37. 457
  38. 349
  39. 410
  40. 128

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