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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 818 · 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. 1.82 + 87 =
  2. 2.192 + 28 =
  3. 3.429 + 89 =
  4. 4.92 + 67 =
  5. 5.391 + 59 =
  6. 6.115 + 28 =
  7. 7.33 + 98 =
  8. 8.149 + 77 =
  9. 9.228 + 57 =
  10. 10.363 + 79 =
  11. 11.114 + 48 =
  12. 12.402 + 68 =
  13. 13.257 + 87 =
  14. 14.43 + 27 =
  15. 15.363 + 39 =
  16. 16.304 + 29 =
  17. 17.319 + 28 =
  18. 18.469 + 59 =
  19. 19.234 + 48 =
  20. 20.368 + 79 =
  21. 21.339 + 59 =
  22. 22.148 + 57 =
  23. 23.82 + 68 =
  24. 24.457 + 39 =
  25. 25.455 + 79 =
  26. 26.495 + 77 =
  27. 27.439 + 89 =
  28. 28.113 + 68 =
  29. 29.284 + 28 =
  30. 30.176 + 67 =
  31. 31.283 + 89 =
  32. 32.206 + 88 =
  33. 33.242 + 29 =
  34. 34.54 + 78 =
  35. 35.317 + 28 =
  36. 36.51 + 47 =
  37. 37.306 + 78 =
  38. 38.321 + 49 =
  39. 39.464 + 47 =
  40. 40.104 + 19 =

Answer key

  1. 169
  2. 220
  3. 518
  4. 159
  5. 450
  6. 143
  7. 131
  8. 226
  9. 285
  10. 442
  11. 162
  12. 470
  13. 344
  14. 70
  15. 402
  16. 333
  17. 347
  18. 528
  19. 282
  20. 447
  21. 398
  22. 205
  23. 150
  24. 496
  25. 534
  26. 572
  27. 528
  28. 181
  29. 312
  30. 243
  31. 372
  32. 294
  33. 271
  34. 132
  35. 345
  36. 98
  37. 384
  38. 370
  39. 511
  40. 123

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