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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 6 · 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. 1.400 + 39 =
  2. 2.343 + 59 =
  3. 3.296 + 47 =
  4. 4.58 + 47 =
  5. 5.382 + 47 =
  6. 6.243 + 98 =
  7. 7.352 + 67 =
  8. 8.111 + 18 =
  9. 9.188 + 17 =
  10. 10.419 + 48 =
  11. 11.174 + 58 =
  12. 12.46 + 88 =
  13. 13.265 + 48 =
  14. 14.142 + 18 =
  15. 15.62 + 98 =
  16. 16.322 + 18 =
  17. 17.460 + 87 =
  18. 18.193 + 59 =
  19. 19.443 + 97 =
  20. 20.315 + 79 =
  21. 21.97 + 97 =
  22. 22.386 + 18 =
  23. 23.122 + 37 =
  24. 24.338 + 69 =
  25. 25.51 + 98 =
  26. 26.94 + 98 =
  27. 27.198 + 19 =
  28. 28.147 + 59 =
  29. 29.132 + 18 =
  30. 30.106 + 18 =
  31. 31.207 + 47 =
  32. 32.396 + 89 =
  33. 33.168 + 97 =
  34. 34.171 + 37 =
  35. 35.274 + 87 =
  36. 36.428 + 77 =
  37. 37.220 + 48 =
  38. 38.315 + 57 =
  39. 39.144 + 47 =
  40. 40.316 + 17 =

Answer key

  1. 439
  2. 402
  3. 343
  4. 105
  5. 429
  6. 341
  7. 419
  8. 129
  9. 205
  10. 467
  11. 232
  12. 134
  13. 313
  14. 160
  15. 160
  16. 340
  17. 547
  18. 252
  19. 540
  20. 394
  21. 194
  22. 404
  23. 159
  24. 407
  25. 149
  26. 192
  27. 217
  28. 206
  29. 150
  30. 124
  31. 254
  32. 485
  33. 265
  34. 208
  35. 361
  36. 505
  37. 268
  38. 372
  39. 191
  40. 333

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