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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 690 · 40 questions
TalentJR

The fast method (Double up): × 4: double, then double again. × 8: double three times. To double a big number, double the tens and the ones separately and add: double 37 = 60 + 14 = 74.

NameDateTime takenScore ___ / 40
  1. 1.107 × 4 =
  2. 2.81 × 4 =
  3. 3.26 × 8 =
  4. 4.16 × 8 =
  5. 5.34 × 8 =
  6. 6.20 × 8 =
  7. 7.90 × 4 =
  8. 8.38 × 4 =
  9. 9.15 × 8 =
  10. 10.37 × 8 =
  11. 11.98 × 4 =
  12. 12.133 × 4 =
  13. 13.55 × 8 =
  14. 14.115 × 4 =
  15. 15.56 × 8 =
  16. 16.70 × 4 =
  17. 17.27 × 8 =
  18. 18.152 × 4 =
  19. 19.58 × 8 =
  20. 20.113 × 4 =
  21. 21.57 × 4 =
  22. 22.92 × 4 =
  23. 23.158 × 4 =
  24. 24.24 × 8 =
  25. 25.63 × 4 =
  26. 26.146 × 4 =
  27. 27.41 × 4 =
  28. 28.154 × 4 =
  29. 29.16 × 8 =
  30. 30.110 × 4 =
  31. 31.86 × 4 =
  32. 32.148 × 4 =
  33. 33.41 × 4 =
  34. 34.34 × 8 =
  35. 35.52 × 8 =
  36. 36.62 × 4 =
  37. 37.118 × 4 =
  38. 38.159 × 4 =
  39. 39.75 × 4 =
  40. 40.19 × 8 =

Answer key

  1. 428
  2. 324
  3. 208
  4. 128
  5. 272
  6. 160
  7. 360
  8. 152
  9. 120
  10. 296
  11. 392
  12. 532
  13. 440
  14. 460
  15. 448
  16. 280
  17. 216
  18. 608
  19. 464
  20. 452
  21. 228
  22. 368
  23. 632
  24. 192
  25. 252
  26. 584
  27. 164
  28. 616
  29. 128
  30. 440
  31. 344
  32. 592
  33. 164
  34. 272
  35. 416
  36. 248
  37. 472
  38. 636
  39. 300
  40. 152

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