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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 165 · 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. 1.211 + 78 =
  2. 2.67 + 78 =
  3. 3.386 + 28 =
  4. 4.240 + 89 =
  5. 5.162 + 88 =
  6. 6.168 + 19 =
  7. 7.160 + 97 =
  8. 8.136 + 57 =
  9. 9.333 + 87 =
  10. 10.41 + 57 =
  11. 11.171 + 58 =
  12. 12.185 + 19 =
  13. 13.395 + 68 =
  14. 14.481 + 17 =
  15. 15.453 + 69 =
  16. 16.234 + 69 =
  17. 17.234 + 67 =
  18. 18.488 + 88 =
  19. 19.229 + 39 =
  20. 20.65 + 99 =
  21. 21.149 + 67 =
  22. 22.417 + 18 =
  23. 23.395 + 29 =
  24. 24.293 + 48 =
  25. 25.202 + 38 =
  26. 26.481 + 18 =
  27. 27.275 + 59 =
  28. 28.451 + 68 =
  29. 29.164 + 98 =
  30. 30.124 + 67 =
  31. 31.224 + 29 =
  32. 32.215 + 98 =
  33. 33.449 + 47 =
  34. 34.371 + 39 =
  35. 35.144 + 17 =
  36. 36.307 + 27 =
  37. 37.325 + 47 =
  38. 38.468 + 58 =
  39. 39.490 + 29 =
  40. 40.460 + 57 =

Answer key

  1. 289
  2. 145
  3. 414
  4. 329
  5. 250
  6. 187
  7. 257
  8. 193
  9. 420
  10. 98
  11. 229
  12. 204
  13. 463
  14. 498
  15. 522
  16. 303
  17. 301
  18. 576
  19. 268
  20. 164
  21. 216
  22. 435
  23. 424
  24. 341
  25. 240
  26. 499
  27. 334
  28. 519
  29. 262
  30. 191
  31. 253
  32. 313
  33. 496
  34. 410
  35. 161
  36. 334
  37. 372
  38. 526
  39. 519
  40. 517

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