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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 835 · 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. 1.98 × 4 =
  2. 2.133 × 4 =
  3. 3.95 × 4 =
  4. 4.98 × 4 =
  5. 5.53 × 8 =
  6. 6.145 × 4 =
  7. 7.86 × 4 =
  8. 8.71 × 8 =
  9. 9.124 × 4 =
  10. 10.75 × 8 =
  11. 11.142 × 4 =
  12. 12.32 × 8 =
  13. 13.15 × 4 =
  14. 14.33 × 8 =
  15. 15.69 × 8 =
  16. 16.57 × 8 =
  17. 17.107 × 4 =
  18. 18.86 × 4 =
  19. 19.65 × 8 =
  20. 20.30 × 8 =
  21. 21.41 × 8 =
  22. 22.64 × 8 =
  23. 23.84 × 4 =
  24. 24.106 × 4 =
  25. 25.33 × 8 =
  26. 26.160 × 4 =
  27. 27.36 × 8 =
  28. 28.15 × 8 =
  29. 29.113 × 4 =
  30. 30.142 × 4 =
  31. 31.37 × 4 =
  32. 32.118 × 4 =
  33. 33.18 × 4 =
  34. 34.35 × 8 =
  35. 35.23 × 8 =
  36. 36.129 × 4 =
  37. 37.69 × 4 =
  38. 38.46 × 8 =
  39. 39.131 × 4 =
  40. 40.22 × 8 =

Answer key

  1. 392
  2. 532
  3. 380
  4. 392
  5. 424
  6. 580
  7. 344
  8. 568
  9. 496
  10. 600
  11. 568
  12. 256
  13. 60
  14. 264
  15. 552
  16. 456
  17. 428
  18. 344
  19. 520
  20. 240
  21. 328
  22. 512
  23. 336
  24. 424
  25. 264
  26. 640
  27. 288
  28. 120
  29. 452
  30. 568
  31. 148
  32. 472
  33. 72
  34. 280
  35. 184
  36. 516
  37. 276
  38. 368
  39. 524
  40. 176

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