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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 764 · 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. 1.143 + 98 =
  2. 2.262 + 47 =
  3. 3.199 + 27 =
  4. 4.160 + 48 =
  5. 5.108 + 37 =
  6. 6.457 + 38 =
  7. 7.369 + 17 =
  8. 8.129 + 39 =
  9. 9.129 + 18 =
  10. 10.294 + 19 =
  11. 11.164 + 99 =
  12. 12.307 + 89 =
  13. 13.162 + 57 =
  14. 14.54 + 89 =
  15. 15.63 + 18 =
  16. 16.322 + 19 =
  17. 17.171 + 67 =
  18. 18.74 + 39 =
  19. 19.416 + 38 =
  20. 20.478 + 47 =
  21. 21.434 + 49 =
  22. 22.268 + 19 =
  23. 23.176 + 57 =
  24. 24.81 + 29 =
  25. 25.215 + 18 =
  26. 26.134 + 37 =
  27. 27.114 + 79 =
  28. 28.98 + 87 =
  29. 29.149 + 27 =
  30. 30.422 + 19 =
  31. 31.230 + 57 =
  32. 32.216 + 37 =
  33. 33.106 + 27 =
  34. 34.276 + 39 =
  35. 35.494 + 69 =
  36. 36.286 + 37 =
  37. 37.266 + 39 =
  38. 38.214 + 87 =
  39. 39.93 + 37 =
  40. 40.160 + 87 =

Answer key

  1. 241
  2. 309
  3. 226
  4. 208
  5. 145
  6. 495
  7. 386
  8. 168
  9. 147
  10. 313
  11. 263
  12. 396
  13. 219
  14. 143
  15. 81
  16. 341
  17. 238
  18. 113
  19. 454
  20. 525
  21. 483
  22. 287
  23. 233
  24. 110
  25. 233
  26. 171
  27. 193
  28. 185
  29. 176
  30. 441
  31. 287
  32. 253
  33. 133
  34. 315
  35. 563
  36. 323
  37. 305
  38. 301
  39. 130
  40. 247

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