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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 668 · 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. 1.33 + 48 =
  2. 2.334 + 27 =
  3. 3.438 + 98 =
  4. 4.496 + 67 =
  5. 5.212 + 88 =
  6. 6.251 + 57 =
  7. 7.238 + 87 =
  8. 8.447 + 29 =
  9. 9.251 + 39 =
  10. 10.434 + 28 =
  11. 11.465 + 18 =
  12. 12.412 + 78 =
  13. 13.188 + 38 =
  14. 14.149 + 97 =
  15. 15.150 + 59 =
  16. 16.308 + 19 =
  17. 17.277 + 79 =
  18. 18.376 + 89 =
  19. 19.256 + 37 =
  20. 20.151 + 59 =
  21. 21.461 + 39 =
  22. 22.385 + 29 =
  23. 23.142 + 97 =
  24. 24.102 + 68 =
  25. 25.344 + 77 =
  26. 26.180 + 77 =
  27. 27.489 + 88 =
  28. 28.458 + 48 =
  29. 29.217 + 78 =
  30. 30.184 + 69 =
  31. 31.465 + 18 =
  32. 32.347 + 17 =
  33. 33.290 + 47 =
  34. 34.294 + 47 =
  35. 35.119 + 67 =
  36. 36.327 + 97 =
  37. 37.222 + 48 =
  38. 38.97 + 98 =
  39. 39.309 + 37 =
  40. 40.246 + 39 =

Answer key

  1. 81
  2. 361
  3. 536
  4. 563
  5. 300
  6. 308
  7. 325
  8. 476
  9. 290
  10. 462
  11. 483
  12. 490
  13. 226
  14. 246
  15. 209
  16. 327
  17. 356
  18. 465
  19. 293
  20. 210
  21. 500
  22. 414
  23. 239
  24. 170
  25. 421
  26. 257
  27. 577
  28. 506
  29. 295
  30. 253
  31. 483
  32. 364
  33. 337
  34. 341
  35. 186
  36. 424
  37. 270
  38. 195
  39. 346
  40. 285

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