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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 202 · 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. 1.55 + 89 =
  2. 2.137 + 57 =
  3. 3.482 + 99 =
  4. 4.464 + 29 =
  5. 5.36 + 87 =
  6. 6.265 + 98 =
  7. 7.354 + 28 =
  8. 8.381 + 89 =
  9. 9.217 + 58 =
  10. 10.49 + 47 =
  11. 11.221 + 17 =
  12. 12.401 + 19 =
  13. 13.62 + 99 =
  14. 14.312 + 67 =
  15. 15.119 + 27 =
  16. 16.251 + 97 =
  17. 17.399 + 17 =
  18. 18.183 + 87 =
  19. 19.145 + 77 =
  20. 20.358 + 19 =
  21. 21.38 + 37 =
  22. 22.240 + 67 =
  23. 23.74 + 19 =
  24. 24.178 + 17 =
  25. 25.27 + 69 =
  26. 26.493 + 29 =
  27. 27.484 + 88 =
  28. 28.386 + 47 =
  29. 29.424 + 18 =
  30. 30.90 + 67 =
  31. 31.246 + 99 =
  32. 32.356 + 49 =
  33. 33.54 + 69 =
  34. 34.492 + 89 =
  35. 35.149 + 79 =
  36. 36.160 + 99 =
  37. 37.114 + 99 =
  38. 38.111 + 88 =
  39. 39.113 + 29 =
  40. 40.86 + 89 =

Answer key

  1. 144
  2. 194
  3. 581
  4. 493
  5. 123
  6. 363
  7. 382
  8. 470
  9. 275
  10. 96
  11. 238
  12. 420
  13. 161
  14. 379
  15. 146
  16. 348
  17. 416
  18. 270
  19. 222
  20. 377
  21. 75
  22. 307
  23. 93
  24. 195
  25. 96
  26. 522
  27. 572
  28. 433
  29. 442
  30. 157
  31. 345
  32. 405
  33. 123
  34. 581
  35. 228
  36. 259
  37. 213
  38. 199
  39. 142
  40. 175

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