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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 663 · 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. 1.63 + 97 =
  2. 2.383 + 28 =
  3. 3.87 + 18 =
  4. 4.220 + 17 =
  5. 5.214 + 77 =
  6. 6.348 + 67 =
  7. 7.423 + 39 =
  8. 8.142 + 88 =
  9. 9.218 + 47 =
  10. 10.282 + 59 =
  11. 11.379 + 69 =
  12. 12.179 + 39 =
  13. 13.361 + 98 =
  14. 14.178 + 27 =
  15. 15.261 + 57 =
  16. 16.161 + 29 =
  17. 17.287 + 28 =
  18. 18.234 + 38 =
  19. 19.209 + 47 =
  20. 20.135 + 58 =
  21. 21.250 + 77 =
  22. 22.139 + 68 =
  23. 23.114 + 57 =
  24. 24.245 + 89 =
  25. 25.481 + 58 =
  26. 26.249 + 49 =
  27. 27.51 + 88 =
  28. 28.429 + 38 =
  29. 29.209 + 77 =
  30. 30.183 + 28 =
  31. 31.470 + 68 =
  32. 32.273 + 27 =
  33. 33.304 + 37 =
  34. 34.111 + 58 =
  35. 35.156 + 79 =
  36. 36.107 + 49 =
  37. 37.236 + 37 =
  38. 38.390 + 19 =
  39. 39.220 + 47 =
  40. 40.129 + 59 =

Answer key

  1. 160
  2. 411
  3. 105
  4. 237
  5. 291
  6. 415
  7. 462
  8. 230
  9. 265
  10. 341
  11. 448
  12. 218
  13. 459
  14. 205
  15. 318
  16. 190
  17. 315
  18. 272
  19. 256
  20. 193
  21. 327
  22. 207
  23. 171
  24. 334
  25. 539
  26. 298
  27. 139
  28. 467
  29. 286
  30. 211
  31. 538
  32. 300
  33. 341
  34. 169
  35. 235
  36. 156
  37. 273
  38. 409
  39. 267
  40. 188

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