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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 777 · 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. 1.32 × 8 =
  2. 2.130 × 4 =
  3. 3.112 × 4 =
  4. 4.14 × 4 =
  5. 5.61 × 8 =
  6. 6.98 × 4 =
  7. 7.28 × 8 =
  8. 8.55 × 4 =
  9. 9.65 × 4 =
  10. 10.120 × 4 =
  11. 11.20 × 4 =
  12. 12.35 × 8 =
  13. 13.141 × 4 =
  14. 14.68 × 8 =
  15. 15.35 × 8 =
  16. 16.110 × 4 =
  17. 17.68 × 8 =
  18. 18.58 × 8 =
  19. 19.12 × 8 =
  20. 20.123 × 4 =
  21. 21.20 × 8 =
  22. 22.38 × 8 =
  23. 23.35 × 4 =
  24. 24.45 × 4 =
  25. 25.28 × 4 =
  26. 26.156 × 4 =
  27. 27.112 × 4 =
  28. 28.60 × 4 =
  29. 29.43 × 4 =
  30. 30.36 × 8 =
  31. 31.38 × 8 =
  32. 32.104 × 4 =
  33. 33.12 × 8 =
  34. 34.25 × 8 =
  35. 35.16 × 4 =
  36. 36.145 × 4 =
  37. 37.154 × 4 =
  38. 38.30 × 8 =
  39. 39.90 × 4 =
  40. 40.24 × 8 =

Answer key

  1. 256
  2. 520
  3. 448
  4. 56
  5. 488
  6. 392
  7. 224
  8. 220
  9. 260
  10. 480
  11. 80
  12. 280
  13. 564
  14. 544
  15. 280
  16. 440
  17. 544
  18. 464
  19. 96
  20. 492
  21. 160
  22. 304
  23. 140
  24. 180
  25. 112
  26. 624
  27. 448
  28. 240
  29. 172
  30. 288
  31. 304
  32. 416
  33. 96
  34. 200
  35. 64
  36. 580
  37. 616
  38. 240
  39. 360
  40. 192

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