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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 787 · 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. 1.36 + 37 =
  2. 2.455 + 99 =
  3. 3.413 + 38 =
  4. 4.219 + 59 =
  5. 5.467 + 58 =
  6. 6.117 + 87 =
  7. 7.363 + 39 =
  8. 8.100 + 57 =
  9. 9.190 + 17 =
  10. 10.489 + 18 =
  11. 11.263 + 99 =
  12. 12.451 + 18 =
  13. 13.120 + 37 =
  14. 14.378 + 88 =
  15. 15.47 + 57 =
  16. 16.33 + 57 =
  17. 17.85 + 27 =
  18. 18.353 + 38 =
  19. 19.366 + 28 =
  20. 20.170 + 28 =
  21. 21.137 + 98 =
  22. 22.476 + 77 =
  23. 23.73 + 37 =
  24. 24.286 + 17 =
  25. 25.271 + 29 =
  26. 26.199 + 69 =
  27. 27.499 + 67 =
  28. 28.194 + 69 =
  29. 29.278 + 27 =
  30. 30.409 + 48 =
  31. 31.496 + 27 =
  32. 32.160 + 97 =
  33. 33.493 + 77 =
  34. 34.468 + 79 =
  35. 35.164 + 69 =
  36. 36.129 + 47 =
  37. 37.108 + 27 =
  38. 38.338 + 78 =
  39. 39.122 + 18 =
  40. 40.129 + 77 =

Answer key

  1. 73
  2. 554
  3. 451
  4. 278
  5. 525
  6. 204
  7. 402
  8. 157
  9. 207
  10. 507
  11. 362
  12. 469
  13. 157
  14. 466
  15. 104
  16. 90
  17. 112
  18. 391
  19. 394
  20. 198
  21. 235
  22. 553
  23. 110
  24. 303
  25. 300
  26. 268
  27. 566
  28. 263
  29. 305
  30. 457
  31. 523
  32. 257
  33. 570
  34. 547
  35. 233
  36. 176
  37. 135
  38. 416
  39. 140
  40. 206

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