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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 170 · 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. 1.40 × 8 =
  2. 2.31 × 8 =
  3. 3.59 × 4 =
  4. 4.21 × 8 =
  5. 5.53 × 8 =
  6. 6.34 × 4 =
  7. 7.51 × 8 =
  8. 8.48 × 8 =
  9. 9.21 × 8 =
  10. 10.16 × 8 =
  11. 11.150 × 4 =
  12. 12.100 × 4 =
  13. 13.72 × 4 =
  14. 14.34 × 8 =
  15. 15.104 × 4 =
  16. 16.16 × 8 =
  17. 17.124 × 4 =
  18. 18.44 × 4 =
  19. 19.44 × 8 =
  20. 20.29 × 4 =
  21. 21.123 × 4 =
  22. 22.61 × 8 =
  23. 23.121 × 4 =
  24. 24.70 × 8 =
  25. 25.19 × 8 =
  26. 26.154 × 4 =
  27. 27.106 × 4 =
  28. 28.54 × 4 =
  29. 29.28 × 8 =
  30. 30.57 × 8 =
  31. 31.27 × 8 =
  32. 32.54 × 4 =
  33. 33.22 × 8 =
  34. 34.46 × 4 =
  35. 35.103 × 4 =
  36. 36.16 × 4 =
  37. 37.70 × 8 =
  38. 38.63 × 4 =
  39. 39.23 × 8 =
  40. 40.52 × 4 =

Answer key

  1. 320
  2. 248
  3. 236
  4. 168
  5. 424
  6. 136
  7. 408
  8. 384
  9. 168
  10. 128
  11. 600
  12. 400
  13. 288
  14. 272
  15. 416
  16. 128
  17. 496
  18. 176
  19. 352
  20. 116
  21. 492
  22. 488
  23. 484
  24. 560
  25. 152
  26. 616
  27. 424
  28. 216
  29. 224
  30. 456
  31. 216
  32. 216
  33. 176
  34. 184
  35. 412
  36. 64
  37. 560
  38. 252
  39. 184
  40. 208

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