← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 252 · 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. 1.148 + 47 =
  2. 2.57 + 38 =
  3. 3.207 + 77 =
  4. 4.127 + 59 =
  5. 5.97 + 29 =
  6. 6.166 + 87 =
  7. 7.87 + 47 =
  8. 8.314 + 48 =
  9. 9.317 + 77 =
  10. 10.233 + 68 =
  11. 11.223 + 37 =
  12. 12.382 + 27 =
  13. 13.122 + 49 =
  14. 14.151 + 69 =
  15. 15.470 + 39 =
  16. 16.326 + 87 =
  17. 17.47 + 69 =
  18. 18.74 + 47 =
  19. 19.271 + 68 =
  20. 20.212 + 58 =
  21. 21.447 + 29 =
  22. 22.74 + 38 =
  23. 23.53 + 19 =
  24. 24.237 + 88 =
  25. 25.407 + 17 =
  26. 26.341 + 97 =
  27. 27.395 + 87 =
  28. 28.78 + 47 =
  29. 29.254 + 98 =
  30. 30.251 + 37 =
  31. 31.78 + 57 =
  32. 32.330 + 47 =
  33. 33.109 + 78 =
  34. 34.277 + 19 =
  35. 35.76 + 78 =
  36. 36.319 + 28 =
  37. 37.298 + 37 =
  38. 38.230 + 87 =
  39. 39.203 + 89 =
  40. 40.294 + 28 =

Answer key

  1. 195
  2. 95
  3. 284
  4. 186
  5. 126
  6. 253
  7. 134
  8. 362
  9. 394
  10. 301
  11. 260
  12. 409
  13. 171
  14. 220
  15. 509
  16. 413
  17. 116
  18. 121
  19. 339
  20. 270
  21. 476
  22. 112
  23. 72
  24. 325
  25. 424
  26. 438
  27. 482
  28. 125
  29. 352
  30. 288
  31. 135
  32. 377
  33. 187
  34. 296
  35. 154
  36. 347
  37. 335
  38. 317
  39. 292
  40. 322

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths