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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 92 · 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. 1.404 + 77 =
  2. 2.191 + 77 =
  3. 3.136 + 18 =
  4. 4.106 + 27 =
  5. 5.407 + 37 =
  6. 6.151 + 58 =
  7. 7.428 + 69 =
  8. 8.112 + 97 =
  9. 9.279 + 28 =
  10. 10.187 + 98 =
  11. 11.142 + 78 =
  12. 12.169 + 59 =
  13. 13.63 + 39 =
  14. 14.496 + 89 =
  15. 15.100 + 29 =
  16. 16.312 + 87 =
  17. 17.72 + 97 =
  18. 18.209 + 79 =
  19. 19.342 + 87 =
  20. 20.432 + 48 =
  21. 21.456 + 99 =
  22. 22.449 + 48 =
  23. 23.359 + 69 =
  24. 24.450 + 37 =
  25. 25.442 + 17 =
  26. 26.63 + 27 =
  27. 27.300 + 17 =
  28. 28.48 + 19 =
  29. 29.31 + 99 =
  30. 30.26 + 69 =
  31. 31.282 + 29 =
  32. 32.203 + 48 =
  33. 33.428 + 97 =
  34. 34.478 + 38 =
  35. 35.183 + 79 =
  36. 36.443 + 59 =
  37. 37.93 + 48 =
  38. 38.353 + 47 =
  39. 39.473 + 17 =
  40. 40.247 + 58 =

Answer key

  1. 481
  2. 268
  3. 154
  4. 133
  5. 444
  6. 209
  7. 497
  8. 209
  9. 307
  10. 285
  11. 220
  12. 228
  13. 102
  14. 585
  15. 129
  16. 399
  17. 169
  18. 288
  19. 429
  20. 480
  21. 555
  22. 497
  23. 428
  24. 487
  25. 459
  26. 90
  27. 317
  28. 67
  29. 130
  30. 95
  31. 311
  32. 251
  33. 525
  34. 516
  35. 262
  36. 502
  37. 141
  38. 400
  39. 490
  40. 305

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