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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 539 · 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. 1.404 + 38 =
  2. 2.172 + 97 =
  3. 3.40 + 87 =
  4. 4.108 + 87 =
  5. 5.422 + 37 =
  6. 6.249 + 38 =
  7. 7.118 + 18 =
  8. 8.87 + 48 =
  9. 9.498 + 99 =
  10. 10.394 + 47 =
  11. 11.145 + 17 =
  12. 12.348 + 48 =
  13. 13.293 + 39 =
  14. 14.182 + 98 =
  15. 15.50 + 19 =
  16. 16.151 + 57 =
  17. 17.218 + 67 =
  18. 18.350 + 39 =
  19. 19.268 + 97 =
  20. 20.34 + 47 =
  21. 21.159 + 37 =
  22. 22.145 + 79 =
  23. 23.90 + 77 =
  24. 24.461 + 37 =
  25. 25.74 + 47 =
  26. 26.117 + 17 =
  27. 27.457 + 69 =
  28. 28.359 + 48 =
  29. 29.136 + 39 =
  30. 30.298 + 49 =
  31. 31.42 + 68 =
  32. 32.44 + 99 =
  33. 33.253 + 88 =
  34. 34.481 + 58 =
  35. 35.65 + 27 =
  36. 36.358 + 38 =
  37. 37.25 + 59 =
  38. 38.146 + 77 =
  39. 39.170 + 97 =
  40. 40.175 + 89 =

Answer key

  1. 442
  2. 269
  3. 127
  4. 195
  5. 459
  6. 287
  7. 136
  8. 135
  9. 597
  10. 441
  11. 162
  12. 396
  13. 332
  14. 280
  15. 69
  16. 208
  17. 285
  18. 389
  19. 365
  20. 81
  21. 196
  22. 224
  23. 167
  24. 498
  25. 121
  26. 134
  27. 526
  28. 407
  29. 175
  30. 347
  31. 110
  32. 143
  33. 341
  34. 539
  35. 92
  36. 396
  37. 84
  38. 223
  39. 267
  40. 264

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