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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 310 · 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. 1.321 + 97 =
  2. 2.178 + 68 =
  3. 3.387 + 69 =
  4. 4.239 + 57 =
  5. 5.475 + 88 =
  6. 6.109 + 28 =
  7. 7.443 + 18 =
  8. 8.91 + 38 =
  9. 9.109 + 67 =
  10. 10.445 + 67 =
  11. 11.361 + 98 =
  12. 12.92 + 28 =
  13. 13.353 + 77 =
  14. 14.258 + 59 =
  15. 15.411 + 79 =
  16. 16.65 + 97 =
  17. 17.34 + 79 =
  18. 18.176 + 27 =
  19. 19.248 + 97 =
  20. 20.149 + 98 =
  21. 21.151 + 88 =
  22. 22.77 + 49 =
  23. 23.182 + 49 =
  24. 24.76 + 39 =
  25. 25.324 + 98 =
  26. 26.399 + 38 =
  27. 27.462 + 57 =
  28. 28.48 + 59 =
  29. 29.42 + 88 =
  30. 30.366 + 18 =
  31. 31.379 + 48 =
  32. 32.297 + 57 =
  33. 33.278 + 28 =
  34. 34.129 + 38 =
  35. 35.234 + 38 =
  36. 36.134 + 38 =
  37. 37.56 + 18 =
  38. 38.224 + 88 =
  39. 39.117 + 79 =
  40. 40.380 + 27 =

Answer key

  1. 418
  2. 246
  3. 456
  4. 296
  5. 563
  6. 137
  7. 461
  8. 129
  9. 176
  10. 512
  11. 459
  12. 120
  13. 430
  14. 317
  15. 490
  16. 162
  17. 113
  18. 203
  19. 345
  20. 247
  21. 239
  22. 126
  23. 231
  24. 115
  25. 422
  26. 437
  27. 519
  28. 107
  29. 130
  30. 384
  31. 427
  32. 354
  33. 306
  34. 167
  35. 272
  36. 172
  37. 74
  38. 312
  39. 196
  40. 407

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