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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 243 · 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. 1.206 + 88 =
  2. 2.152 + 17 =
  3. 3.269 + 27 =
  4. 4.343 + 18 =
  5. 5.133 + 89 =
  6. 6.245 + 67 =
  7. 7.47 + 39 =
  8. 8.288 + 18 =
  9. 9.110 + 39 =
  10. 10.315 + 89 =
  11. 11.106 + 69 =
  12. 12.332 + 27 =
  13. 13.263 + 28 =
  14. 14.137 + 28 =
  15. 15.401 + 99 =
  16. 16.72 + 47 =
  17. 17.130 + 99 =
  18. 18.180 + 68 =
  19. 19.47 + 47 =
  20. 20.61 + 67 =
  21. 21.301 + 58 =
  22. 22.200 + 99 =
  23. 23.163 + 38 =
  24. 24.323 + 97 =
  25. 25.402 + 28 =
  26. 26.142 + 59 =
  27. 27.335 + 19 =
  28. 28.376 + 38 =
  29. 29.267 + 47 =
  30. 30.434 + 98 =
  31. 31.28 + 18 =
  32. 32.189 + 39 =
  33. 33.183 + 29 =
  34. 34.147 + 97 =
  35. 35.371 + 27 =
  36. 36.462 + 88 =
  37. 37.88 + 19 =
  38. 38.48 + 38 =
  39. 39.122 + 29 =
  40. 40.492 + 57 =

Answer key

  1. 294
  2. 169
  3. 296
  4. 361
  5. 222
  6. 312
  7. 86
  8. 306
  9. 149
  10. 404
  11. 175
  12. 359
  13. 291
  14. 165
  15. 500
  16. 119
  17. 229
  18. 248
  19. 94
  20. 128
  21. 359
  22. 299
  23. 201
  24. 420
  25. 430
  26. 201
  27. 354
  28. 414
  29. 314
  30. 532
  31. 46
  32. 228
  33. 212
  34. 244
  35. 398
  36. 550
  37. 107
  38. 86
  39. 151
  40. 549

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