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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 99 · 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. 1.439 + 67 =
  2. 2.27 + 18 =
  3. 3.75 + 59 =
  4. 4.329 + 78 =
  5. 5.389 + 17 =
  6. 6.223 + 49 =
  7. 7.494 + 37 =
  8. 8.272 + 98 =
  9. 9.439 + 19 =
  10. 10.176 + 28 =
  11. 11.55 + 19 =
  12. 12.223 + 37 =
  13. 13.81 + 77 =
  14. 14.112 + 68 =
  15. 15.128 + 87 =
  16. 16.459 + 77 =
  17. 17.401 + 67 =
  18. 18.94 + 68 =
  19. 19.194 + 87 =
  20. 20.439 + 17 =
  21. 21.80 + 27 =
  22. 22.253 + 28 =
  23. 23.68 + 69 =
  24. 24.50 + 67 =
  25. 25.330 + 19 =
  26. 26.369 + 88 =
  27. 27.462 + 48 =
  28. 28.380 + 39 =
  29. 29.429 + 47 =
  30. 30.220 + 87 =
  31. 31.399 + 17 =
  32. 32.374 + 28 =
  33. 33.231 + 97 =
  34. 34.489 + 48 =
  35. 35.126 + 17 =
  36. 36.140 + 69 =
  37. 37.92 + 69 =
  38. 38.46 + 69 =
  39. 39.221 + 27 =
  40. 40.425 + 17 =

Answer key

  1. 506
  2. 45
  3. 134
  4. 407
  5. 406
  6. 272
  7. 531
  8. 370
  9. 458
  10. 204
  11. 74
  12. 260
  13. 158
  14. 180
  15. 215
  16. 536
  17. 468
  18. 162
  19. 281
  20. 456
  21. 107
  22. 281
  23. 137
  24. 117
  25. 349
  26. 457
  27. 510
  28. 419
  29. 476
  30. 307
  31. 416
  32. 402
  33. 328
  34. 537
  35. 143
  36. 209
  37. 161
  38. 115
  39. 248
  40. 442

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