← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 386 · 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. 1.139 + 19 =
  2. 2.333 + 79 =
  3. 3.351 + 67 =
  4. 4.353 + 29 =
  5. 5.225 + 49 =
  6. 6.139 + 98 =
  7. 7.67 + 67 =
  8. 8.325 + 58 =
  9. 9.250 + 29 =
  10. 10.134 + 67 =
  11. 11.144 + 49 =
  12. 12.312 + 68 =
  13. 13.362 + 67 =
  14. 14.63 + 78 =
  15. 15.278 + 28 =
  16. 16.122 + 17 =
  17. 17.256 + 28 =
  18. 18.449 + 99 =
  19. 19.212 + 27 =
  20. 20.149 + 38 =
  21. 21.251 + 27 =
  22. 22.424 + 28 =
  23. 23.146 + 98 =
  24. 24.304 + 97 =
  25. 25.379 + 27 =
  26. 26.314 + 78 =
  27. 27.34 + 58 =
  28. 28.495 + 49 =
  29. 29.109 + 77 =
  30. 30.375 + 59 =
  31. 31.329 + 87 =
  32. 32.337 + 38 =
  33. 33.98 + 57 =
  34. 34.423 + 37 =
  35. 35.391 + 87 =
  36. 36.114 + 27 =
  37. 37.142 + 28 =
  38. 38.241 + 98 =
  39. 39.303 + 58 =
  40. 40.283 + 57 =

Answer key

  1. 158
  2. 412
  3. 418
  4. 382
  5. 274
  6. 237
  7. 134
  8. 383
  9. 279
  10. 201
  11. 193
  12. 380
  13. 429
  14. 141
  15. 306
  16. 139
  17. 284
  18. 548
  19. 239
  20. 187
  21. 278
  22. 452
  23. 244
  24. 401
  25. 406
  26. 392
  27. 92
  28. 544
  29. 186
  30. 434
  31. 416
  32. 375
  33. 155
  34. 460
  35. 478
  36. 141
  37. 170
  38. 339
  39. 361
  40. 340

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