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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 707 · 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. 1.118 + 59 =
  2. 2.497 + 47 =
  3. 3.486 + 38 =
  4. 4.63 + 37 =
  5. 5.447 + 27 =
  6. 6.104 + 39 =
  7. 7.475 + 59 =
  8. 8.345 + 27 =
  9. 9.67 + 59 =
  10. 10.447 + 78 =
  11. 11.423 + 77 =
  12. 12.110 + 49 =
  13. 13.185 + 27 =
  14. 14.30 + 18 =
  15. 15.195 + 28 =
  16. 16.71 + 38 =
  17. 17.379 + 37 =
  18. 18.243 + 68 =
  19. 19.242 + 78 =
  20. 20.461 + 29 =
  21. 21.80 + 39 =
  22. 22.168 + 77 =
  23. 23.193 + 68 =
  24. 24.69 + 98 =
  25. 25.351 + 57 =
  26. 26.343 + 17 =
  27. 27.124 + 68 =
  28. 28.290 + 27 =
  29. 29.151 + 87 =
  30. 30.150 + 39 =
  31. 31.195 + 69 =
  32. 32.122 + 98 =
  33. 33.90 + 39 =
  34. 34.190 + 47 =
  35. 35.272 + 79 =
  36. 36.432 + 47 =
  37. 37.238 + 77 =
  38. 38.145 + 78 =
  39. 39.58 + 77 =
  40. 40.140 + 99 =

Answer key

  1. 177
  2. 544
  3. 524
  4. 100
  5. 474
  6. 143
  7. 534
  8. 372
  9. 126
  10. 525
  11. 500
  12. 159
  13. 212
  14. 48
  15. 223
  16. 109
  17. 416
  18. 311
  19. 320
  20. 490
  21. 119
  22. 245
  23. 261
  24. 167
  25. 408
  26. 360
  27. 192
  28. 317
  29. 238
  30. 189
  31. 264
  32. 220
  33. 129
  34. 237
  35. 351
  36. 479
  37. 315
  38. 223
  39. 135
  40. 239

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