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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 236 · 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. 1.115 + 38 =
  2. 2.384 + 57 =
  3. 3.42 + 98 =
  4. 4.260 + 79 =
  5. 5.243 + 59 =
  6. 6.107 + 58 =
  7. 7.476 + 28 =
  8. 8.363 + 97 =
  9. 9.480 + 89 =
  10. 10.50 + 19 =
  11. 11.425 + 99 =
  12. 12.227 + 37 =
  13. 13.25 + 88 =
  14. 14.58 + 48 =
  15. 15.268 + 17 =
  16. 16.129 + 67 =
  17. 17.344 + 67 =
  18. 18.458 + 98 =
  19. 19.219 + 47 =
  20. 20.414 + 38 =
  21. 21.379 + 57 =
  22. 22.296 + 27 =
  23. 23.277 + 47 =
  24. 24.258 + 19 =
  25. 25.238 + 89 =
  26. 26.372 + 27 =
  27. 27.388 + 28 =
  28. 28.220 + 88 =
  29. 29.47 + 98 =
  30. 30.429 + 17 =
  31. 31.322 + 37 =
  32. 32.320 + 87 =
  33. 33.181 + 79 =
  34. 34.432 + 37 =
  35. 35.311 + 48 =
  36. 36.233 + 27 =
  37. 37.242 + 89 =
  38. 38.281 + 87 =
  39. 39.454 + 28 =
  40. 40.245 + 19 =

Answer key

  1. 153
  2. 441
  3. 140
  4. 339
  5. 302
  6. 165
  7. 504
  8. 460
  9. 569
  10. 69
  11. 524
  12. 264
  13. 113
  14. 106
  15. 285
  16. 196
  17. 411
  18. 556
  19. 266
  20. 452
  21. 436
  22. 323
  23. 324
  24. 277
  25. 327
  26. 399
  27. 416
  28. 308
  29. 145
  30. 446
  31. 359
  32. 407
  33. 260
  34. 469
  35. 359
  36. 260
  37. 331
  38. 368
  39. 482
  40. 264

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