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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 209 · 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. 1.353 + 37 =
  2. 2.383 + 27 =
  3. 3.328 + 87 =
  4. 4.202 + 37 =
  5. 5.370 + 69 =
  6. 6.223 + 98 =
  7. 7.340 + 88 =
  8. 8.32 + 99 =
  9. 9.481 + 57 =
  10. 10.377 + 19 =
  11. 11.50 + 68 =
  12. 12.137 + 89 =
  13. 13.382 + 67 =
  14. 14.223 + 27 =
  15. 15.451 + 97 =
  16. 16.362 + 38 =
  17. 17.246 + 37 =
  18. 18.433 + 38 =
  19. 19.452 + 57 =
  20. 20.149 + 19 =
  21. 21.485 + 48 =
  22. 22.43 + 28 =
  23. 23.323 + 99 =
  24. 24.127 + 97 =
  25. 25.339 + 88 =
  26. 26.343 + 29 =
  27. 27.253 + 37 =
  28. 28.420 + 99 =
  29. 29.315 + 68 =
  30. 30.92 + 67 =
  31. 31.312 + 68 =
  32. 32.398 + 48 =
  33. 33.145 + 17 =
  34. 34.387 + 27 =
  35. 35.401 + 58 =
  36. 36.35 + 69 =
  37. 37.220 + 58 =
  38. 38.229 + 18 =
  39. 39.263 + 69 =
  40. 40.134 + 87 =

Answer key

  1. 390
  2. 410
  3. 415
  4. 239
  5. 439
  6. 321
  7. 428
  8. 131
  9. 538
  10. 396
  11. 118
  12. 226
  13. 449
  14. 250
  15. 548
  16. 400
  17. 283
  18. 471
  19. 509
  20. 168
  21. 533
  22. 71
  23. 422
  24. 224
  25. 427
  26. 372
  27. 290
  28. 519
  29. 383
  30. 159
  31. 380
  32. 446
  33. 162
  34. 414
  35. 459
  36. 104
  37. 278
  38. 247
  39. 332
  40. 221

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