← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 905 · 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. 1.220 + 59 =
  2. 2.346 + 18 =
  3. 3.230 + 37 =
  4. 4.90 + 88 =
  5. 5.114 + 89 =
  6. 6.368 + 79 =
  7. 7.111 + 57 =
  8. 8.227 + 88 =
  9. 9.138 + 88 =
  10. 10.350 + 87 =
  11. 11.103 + 27 =
  12. 12.77 + 67 =
  13. 13.237 + 29 =
  14. 14.223 + 59 =
  15. 15.373 + 69 =
  16. 16.75 + 57 =
  17. 17.113 + 87 =
  18. 18.278 + 87 =
  19. 19.138 + 38 =
  20. 20.400 + 39 =
  21. 21.287 + 37 =
  22. 22.240 + 27 =
  23. 23.142 + 39 =
  24. 24.252 + 59 =
  25. 25.120 + 39 =
  26. 26.42 + 49 =
  27. 27.202 + 29 =
  28. 28.224 + 97 =
  29. 29.471 + 88 =
  30. 30.34 + 27 =
  31. 31.88 + 49 =
  32. 32.323 + 88 =
  33. 33.93 + 79 =
  34. 34.134 + 77 =
  35. 35.258 + 79 =
  36. 36.272 + 29 =
  37. 37.141 + 97 =
  38. 38.83 + 17 =
  39. 39.455 + 99 =
  40. 40.76 + 69 =

Answer key

  1. 279
  2. 364
  3. 267
  4. 178
  5. 203
  6. 447
  7. 168
  8. 315
  9. 226
  10. 437
  11. 130
  12. 144
  13. 266
  14. 282
  15. 442
  16. 132
  17. 200
  18. 365
  19. 176
  20. 439
  21. 324
  22. 267
  23. 181
  24. 311
  25. 159
  26. 91
  27. 231
  28. 321
  29. 559
  30. 61
  31. 137
  32. 411
  33. 172
  34. 211
  35. 337
  36. 301
  37. 238
  38. 100
  39. 554
  40. 145

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