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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 739 · 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. 1.324 + 79 =
  2. 2.275 + 89 =
  3. 3.127 + 37 =
  4. 4.118 + 39 =
  5. 5.254 + 67 =
  6. 6.480 + 18 =
  7. 7.158 + 19 =
  8. 8.161 + 77 =
  9. 9.93 + 67 =
  10. 10.201 + 17 =
  11. 11.226 + 27 =
  12. 12.183 + 37 =
  13. 13.470 + 67 =
  14. 14.179 + 79 =
  15. 15.126 + 68 =
  16. 16.310 + 98 =
  17. 17.294 + 77 =
  18. 18.193 + 39 =
  19. 19.146 + 68 =
  20. 20.94 + 49 =
  21. 21.371 + 49 =
  22. 22.149 + 98 =
  23. 23.51 + 49 =
  24. 24.77 + 79 =
  25. 25.448 + 28 =
  26. 26.124 + 37 =
  27. 27.382 + 77 =
  28. 28.117 + 77 =
  29. 29.58 + 39 =
  30. 30.460 + 89 =
  31. 31.472 + 67 =
  32. 32.232 + 48 =
  33. 33.401 + 17 =
  34. 34.67 + 27 =
  35. 35.119 + 87 =
  36. 36.360 + 17 =
  37. 37.57 + 37 =
  38. 38.45 + 69 =
  39. 39.451 + 39 =
  40. 40.189 + 88 =

Answer key

  1. 403
  2. 364
  3. 164
  4. 157
  5. 321
  6. 498
  7. 177
  8. 238
  9. 160
  10. 218
  11. 253
  12. 220
  13. 537
  14. 258
  15. 194
  16. 408
  17. 371
  18. 232
  19. 214
  20. 143
  21. 420
  22. 247
  23. 100
  24. 156
  25. 476
  26. 161
  27. 459
  28. 194
  29. 97
  30. 549
  31. 539
  32. 280
  33. 418
  34. 94
  35. 206
  36. 377
  37. 94
  38. 114
  39. 490
  40. 277

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