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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 130 · 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. 1.308 + 37 =
  2. 2.101 + 37 =
  3. 3.488 + 77 =
  4. 4.40 + 58 =
  5. 5.192 + 17 =
  6. 6.488 + 37 =
  7. 7.329 + 28 =
  8. 8.152 + 38 =
  9. 9.278 + 49 =
  10. 10.76 + 18 =
  11. 11.116 + 29 =
  12. 12.146 + 69 =
  13. 13.115 + 67 =
  14. 14.181 + 69 =
  15. 15.270 + 89 =
  16. 16.284 + 89 =
  17. 17.176 + 77 =
  18. 18.38 + 29 =
  19. 19.479 + 29 =
  20. 20.477 + 47 =
  21. 21.156 + 57 =
  22. 22.400 + 99 =
  23. 23.270 + 87 =
  24. 24.303 + 19 =
  25. 25.30 + 79 =
  26. 26.451 + 39 =
  27. 27.88 + 59 =
  28. 28.222 + 17 =
  29. 29.456 + 28 =
  30. 30.359 + 77 =
  31. 31.188 + 47 =
  32. 32.318 + 19 =
  33. 33.432 + 59 =
  34. 34.343 + 27 =
  35. 35.154 + 38 =
  36. 36.275 + 57 =
  37. 37.130 + 58 =
  38. 38.345 + 78 =
  39. 39.495 + 48 =
  40. 40.90 + 17 =

Answer key

  1. 345
  2. 138
  3. 565
  4. 98
  5. 209
  6. 525
  7. 357
  8. 190
  9. 327
  10. 94
  11. 145
  12. 215
  13. 182
  14. 250
  15. 359
  16. 373
  17. 253
  18. 67
  19. 508
  20. 524
  21. 213
  22. 499
  23. 357
  24. 322
  25. 109
  26. 490
  27. 147
  28. 239
  29. 484
  30. 436
  31. 235
  32. 337
  33. 491
  34. 370
  35. 192
  36. 332
  37. 188
  38. 423
  39. 543
  40. 107

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