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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 194 · 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. 1.127 + 28 =
  2. 2.480 + 67 =
  3. 3.384 + 79 =
  4. 4.344 + 48 =
  5. 5.306 + 77 =
  6. 6.251 + 69 =
  7. 7.204 + 88 =
  8. 8.130 + 98 =
  9. 9.340 + 67 =
  10. 10.253 + 99 =
  11. 11.182 + 99 =
  12. 12.251 + 59 =
  13. 13.129 + 29 =
  14. 14.381 + 38 =
  15. 15.306 + 57 =
  16. 16.319 + 18 =
  17. 17.259 + 47 =
  18. 18.206 + 48 =
  19. 19.119 + 19 =
  20. 20.408 + 17 =
  21. 21.276 + 67 =
  22. 22.292 + 79 =
  23. 23.129 + 27 =
  24. 24.451 + 67 =
  25. 25.291 + 97 =
  26. 26.436 + 79 =
  27. 27.301 + 17 =
  28. 28.460 + 68 =
  29. 29.377 + 67 =
  30. 30.372 + 99 =
  31. 31.324 + 17 =
  32. 32.417 + 37 =
  33. 33.465 + 28 =
  34. 34.258 + 57 =
  35. 35.131 + 39 =
  36. 36.444 + 48 =
  37. 37.349 + 88 =
  38. 38.128 + 18 =
  39. 39.80 + 48 =
  40. 40.287 + 37 =

Answer key

  1. 155
  2. 547
  3. 463
  4. 392
  5. 383
  6. 320
  7. 292
  8. 228
  9. 407
  10. 352
  11. 281
  12. 310
  13. 158
  14. 419
  15. 363
  16. 337
  17. 306
  18. 254
  19. 138
  20. 425
  21. 343
  22. 371
  23. 156
  24. 518
  25. 388
  26. 515
  27. 318
  28. 528
  29. 444
  30. 471
  31. 341
  32. 454
  33. 493
  34. 315
  35. 170
  36. 492
  37. 437
  38. 146
  39. 128
  40. 324

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