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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 821 · 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. 1.47 × 8 =
  2. 2.138 × 4 =
  3. 3.39 × 8 =
  4. 4.40 × 8 =
  5. 5.52 × 8 =
  6. 6.13 × 8 =
  7. 7.124 × 4 =
  8. 8.53 × 8 =
  9. 9.68 × 8 =
  10. 10.16 × 8 =
  11. 11.123 × 4 =
  12. 12.38 × 8 =
  13. 13.22 × 8 =
  14. 14.28 × 8 =
  15. 15.28 × 8 =
  16. 16.14 × 4 =
  17. 17.12 × 8 =
  18. 18.30 × 4 =
  19. 19.121 × 4 =
  20. 20.21 × 8 =
  21. 21.24 × 4 =
  22. 22.24 × 8 =
  23. 23.64 × 8 =
  24. 24.19 × 8 =
  25. 25.136 × 4 =
  26. 26.36 × 4 =
  27. 27.24 × 8 =
  28. 28.103 × 4 =
  29. 29.57 × 4 =
  30. 30.62 × 4 =
  31. 31.55 × 8 =
  32. 32.142 × 4 =
  33. 33.46 × 8 =
  34. 34.88 × 4 =
  35. 35.111 × 4 =
  36. 36.127 × 4 =
  37. 37.67 × 8 =
  38. 38.124 × 4 =
  39. 39.13 × 8 =
  40. 40.34 × 4 =

Answer key

  1. 376
  2. 552
  3. 312
  4. 320
  5. 416
  6. 104
  7. 496
  8. 424
  9. 544
  10. 128
  11. 492
  12. 304
  13. 176
  14. 224
  15. 224
  16. 56
  17. 96
  18. 120
  19. 484
  20. 168
  21. 96
  22. 192
  23. 512
  24. 152
  25. 544
  26. 144
  27. 192
  28. 412
  29. 228
  30. 248
  31. 440
  32. 568
  33. 368
  34. 352
  35. 444
  36. 508
  37. 536
  38. 496
  39. 104
  40. 136

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