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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 651 · 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. 1.399 + 49 =
  2. 2.476 + 67 =
  3. 3.379 + 68 =
  4. 4.117 + 17 =
  5. 5.320 + 57 =
  6. 6.140 + 98 =
  7. 7.236 + 17 =
  8. 8.262 + 68 =
  9. 9.306 + 59 =
  10. 10.416 + 39 =
  11. 11.154 + 28 =
  12. 12.355 + 17 =
  13. 13.89 + 77 =
  14. 14.197 + 27 =
  15. 15.327 + 87 =
  16. 16.101 + 68 =
  17. 17.84 + 58 =
  18. 18.182 + 79 =
  19. 19.251 + 67 =
  20. 20.196 + 49 =
  21. 21.414 + 58 =
  22. 22.240 + 97 =
  23. 23.104 + 17 =
  24. 24.188 + 67 =
  25. 25.42 + 57 =
  26. 26.192 + 29 =
  27. 27.124 + 59 =
  28. 28.27 + 17 =
  29. 29.259 + 89 =
  30. 30.453 + 67 =
  31. 31.112 + 17 =
  32. 32.107 + 58 =
  33. 33.68 + 68 =
  34. 34.421 + 69 =
  35. 35.332 + 28 =
  36. 36.347 + 19 =
  37. 37.457 + 28 =
  38. 38.317 + 99 =
  39. 39.34 + 97 =
  40. 40.183 + 88 =

Answer key

  1. 448
  2. 543
  3. 447
  4. 134
  5. 377
  6. 238
  7. 253
  8. 330
  9. 365
  10. 455
  11. 182
  12. 372
  13. 166
  14. 224
  15. 414
  16. 169
  17. 142
  18. 261
  19. 318
  20. 245
  21. 472
  22. 337
  23. 121
  24. 255
  25. 99
  26. 221
  27. 183
  28. 44
  29. 348
  30. 520
  31. 129
  32. 165
  33. 136
  34. 490
  35. 360
  36. 366
  37. 485
  38. 416
  39. 131
  40. 271

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