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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 405 · 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. 1.437 + 18 =
  2. 2.208 + 27 =
  3. 3.401 + 39 =
  4. 4.428 + 98 =
  5. 5.378 + 98 =
  6. 6.280 + 17 =
  7. 7.25 + 67 =
  8. 8.36 + 48 =
  9. 9.25 + 89 =
  10. 10.454 + 18 =
  11. 11.464 + 89 =
  12. 12.29 + 97 =
  13. 13.116 + 29 =
  14. 14.48 + 27 =
  15. 15.377 + 39 =
  16. 16.209 + 58 =
  17. 17.137 + 87 =
  18. 18.118 + 58 =
  19. 19.455 + 98 =
  20. 20.48 + 69 =
  21. 21.53 + 38 =
  22. 22.193 + 99 =
  23. 23.207 + 47 =
  24. 24.121 + 98 =
  25. 25.121 + 79 =
  26. 26.380 + 19 =
  27. 27.169 + 59 =
  28. 28.325 + 87 =
  29. 29.448 + 19 =
  30. 30.306 + 28 =
  31. 31.282 + 58 =
  32. 32.95 + 49 =
  33. 33.374 + 28 =
  34. 34.80 + 68 =
  35. 35.172 + 47 =
  36. 36.171 + 18 =
  37. 37.369 + 59 =
  38. 38.86 + 97 =
  39. 39.431 + 19 =
  40. 40.293 + 39 =

Answer key

  1. 455
  2. 235
  3. 440
  4. 526
  5. 476
  6. 297
  7. 92
  8. 84
  9. 114
  10. 472
  11. 553
  12. 126
  13. 145
  14. 75
  15. 416
  16. 267
  17. 224
  18. 176
  19. 553
  20. 117
  21. 91
  22. 292
  23. 254
  24. 219
  25. 200
  26. 399
  27. 228
  28. 412
  29. 467
  30. 334
  31. 340
  32. 144
  33. 402
  34. 148
  35. 219
  36. 189
  37. 428
  38. 183
  39. 450
  40. 332

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