← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 436 · 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. 1.341 + 18 =
  2. 2.463 + 28 =
  3. 3.362 + 28 =
  4. 4.174 + 27 =
  5. 5.227 + 87 =
  6. 6.204 + 18 =
  7. 7.204 + 18 =
  8. 8.37 + 97 =
  9. 9.188 + 79 =
  10. 10.415 + 49 =
  11. 11.203 + 29 =
  12. 12.392 + 97 =
  13. 13.46 + 88 =
  14. 14.445 + 18 =
  15. 15.55 + 37 =
  16. 16.209 + 79 =
  17. 17.260 + 67 =
  18. 18.498 + 19 =
  19. 19.366 + 67 =
  20. 20.351 + 17 =
  21. 21.50 + 58 =
  22. 22.146 + 37 =
  23. 23.217 + 99 =
  24. 24.271 + 27 =
  25. 25.115 + 47 =
  26. 26.27 + 59 =
  27. 27.455 + 17 =
  28. 28.47 + 18 =
  29. 29.188 + 87 =
  30. 30.460 + 17 =
  31. 31.214 + 88 =
  32. 32.465 + 27 =
  33. 33.248 + 27 =
  34. 34.473 + 57 =
  35. 35.85 + 59 =
  36. 36.358 + 69 =
  37. 37.33 + 29 =
  38. 38.280 + 89 =
  39. 39.297 + 47 =
  40. 40.341 + 99 =

Answer key

  1. 359
  2. 491
  3. 390
  4. 201
  5. 314
  6. 222
  7. 222
  8. 134
  9. 267
  10. 464
  11. 232
  12. 489
  13. 134
  14. 463
  15. 92
  16. 288
  17. 327
  18. 517
  19. 433
  20. 368
  21. 108
  22. 183
  23. 316
  24. 298
  25. 162
  26. 86
  27. 472
  28. 65
  29. 275
  30. 477
  31. 302
  32. 492
  33. 275
  34. 530
  35. 144
  36. 427
  37. 62
  38. 369
  39. 344
  40. 440

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