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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 737 · 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. 1.34 + 18 =
  2. 2.54 + 17 =
  3. 3.105 + 97 =
  4. 4.109 + 99 =
  5. 5.111 + 88 =
  6. 6.251 + 39 =
  7. 7.209 + 17 =
  8. 8.58 + 69 =
  9. 9.36 + 18 =
  10. 10.232 + 37 =
  11. 11.144 + 18 =
  12. 12.67 + 49 =
  13. 13.60 + 59 =
  14. 14.282 + 18 =
  15. 15.317 + 37 =
  16. 16.52 + 78 =
  17. 17.137 + 59 =
  18. 18.390 + 99 =
  19. 19.462 + 57 =
  20. 20.55 + 67 =
  21. 21.155 + 87 =
  22. 22.152 + 48 =
  23. 23.304 + 99 =
  24. 24.493 + 27 =
  25. 25.385 + 78 =
  26. 26.119 + 48 =
  27. 27.92 + 77 =
  28. 28.486 + 17 =
  29. 29.215 + 59 =
  30. 30.391 + 99 =
  31. 31.248 + 48 =
  32. 32.485 + 97 =
  33. 33.211 + 89 =
  34. 34.83 + 79 =
  35. 35.226 + 88 =
  36. 36.291 + 98 =
  37. 37.369 + 48 =
  38. 38.74 + 78 =
  39. 39.451 + 59 =
  40. 40.385 + 98 =

Answer key

  1. 52
  2. 71
  3. 202
  4. 208
  5. 199
  6. 290
  7. 226
  8. 127
  9. 54
  10. 269
  11. 162
  12. 116
  13. 119
  14. 300
  15. 354
  16. 130
  17. 196
  18. 489
  19. 519
  20. 122
  21. 242
  22. 200
  23. 403
  24. 520
  25. 463
  26. 167
  27. 169
  28. 503
  29. 274
  30. 490
  31. 296
  32. 582
  33. 300
  34. 162
  35. 314
  36. 389
  37. 417
  38. 152
  39. 510
  40. 483

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