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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 678 · 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. 1.484 + 37 =
  2. 2.328 + 37 =
  3. 3.137 + 87 =
  4. 4.493 + 59 =
  5. 5.369 + 37 =
  6. 6.40 + 28 =
  7. 7.148 + 98 =
  8. 8.240 + 69 =
  9. 9.461 + 78 =
  10. 10.172 + 39 =
  11. 11.47 + 37 =
  12. 12.163 + 88 =
  13. 13.276 + 47 =
  14. 14.143 + 88 =
  15. 15.473 + 57 =
  16. 16.129 + 99 =
  17. 17.271 + 67 =
  18. 18.135 + 67 =
  19. 19.360 + 39 =
  20. 20.277 + 58 =
  21. 21.86 + 59 =
  22. 22.169 + 78 =
  23. 23.54 + 28 =
  24. 24.261 + 39 =
  25. 25.373 + 47 =
  26. 26.197 + 87 =
  27. 27.156 + 97 =
  28. 28.288 + 69 =
  29. 29.459 + 59 =
  30. 30.246 + 27 =
  31. 31.330 + 67 =
  32. 32.377 + 37 =
  33. 33.154 + 38 =
  34. 34.110 + 69 =
  35. 35.125 + 29 =
  36. 36.314 + 58 =
  37. 37.316 + 29 =
  38. 38.284 + 98 =
  39. 39.452 + 89 =
  40. 40.90 + 79 =

Answer key

  1. 521
  2. 365
  3. 224
  4. 552
  5. 406
  6. 68
  7. 246
  8. 309
  9. 539
  10. 211
  11. 84
  12. 251
  13. 323
  14. 231
  15. 530
  16. 228
  17. 338
  18. 202
  19. 399
  20. 335
  21. 145
  22. 247
  23. 82
  24. 300
  25. 420
  26. 284
  27. 253
  28. 357
  29. 518
  30. 273
  31. 397
  32. 414
  33. 192
  34. 179
  35. 154
  36. 372
  37. 345
  38. 382
  39. 541
  40. 169

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