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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 235 · 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. 1.499 + 98 =
  2. 2.469 + 99 =
  3. 3.273 + 37 =
  4. 4.236 + 77 =
  5. 5.32 + 59 =
  6. 6.99 + 68 =
  7. 7.216 + 39 =
  8. 8.198 + 89 =
  9. 9.97 + 49 =
  10. 10.446 + 29 =
  11. 11.241 + 38 =
  12. 12.329 + 78 =
  13. 13.331 + 98 =
  14. 14.274 + 18 =
  15. 15.93 + 17 =
  16. 16.474 + 98 =
  17. 17.378 + 67 =
  18. 18.164 + 18 =
  19. 19.243 + 17 =
  20. 20.488 + 19 =
  21. 21.309 + 78 =
  22. 22.405 + 69 =
  23. 23.66 + 88 =
  24. 24.62 + 98 =
  25. 25.388 + 88 =
  26. 26.166 + 39 =
  27. 27.86 + 57 =
  28. 28.422 + 57 =
  29. 29.50 + 27 =
  30. 30.476 + 38 =
  31. 31.350 + 18 =
  32. 32.154 + 47 =
  33. 33.402 + 88 =
  34. 34.211 + 29 =
  35. 35.283 + 79 =
  36. 36.316 + 69 =
  37. 37.477 + 88 =
  38. 38.96 + 27 =
  39. 39.98 + 98 =
  40. 40.213 + 47 =

Answer key

  1. 597
  2. 568
  3. 310
  4. 313
  5. 91
  6. 167
  7. 255
  8. 287
  9. 146
  10. 475
  11. 279
  12. 407
  13. 429
  14. 292
  15. 110
  16. 572
  17. 445
  18. 182
  19. 260
  20. 507
  21. 387
  22. 474
  23. 154
  24. 160
  25. 476
  26. 205
  27. 143
  28. 479
  29. 77
  30. 514
  31. 368
  32. 201
  33. 490
  34. 240
  35. 362
  36. 385
  37. 565
  38. 123
  39. 196
  40. 260

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