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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 645 · 40 questions
TalentJR

How to do it in your head (Double, double, double): × 2: double once. × 4: double, then double again. × 8: double three times.

NameDateTime takenScore ___ / 40
  1. 1.19 × 8 =
  2. 2.37 × 8 =
  3. 3.13 × 4 =
  4. 4.37 × 4 =
  5. 5.73 × 4 =
  6. 6.72 × 4 =
  7. 7.57 × 4 =
  8. 8.41 × 4 =
  9. 9.22 × 8 =
  10. 10.19 × 4 =
  11. 11.40 × 8 =
  12. 12.25 × 8 =
  13. 13.20 × 8 =
  14. 14.68 × 4 =
  15. 15.60 × 4 =
  16. 16.70 × 4 =
  17. 17.36 × 8 =
  18. 18.33 × 8 =
  19. 19.47 × 4 =
  20. 20.39 × 8 =
  21. 21.14 × 8 =
  22. 22.18 × 8 =
  23. 23.46 × 4 =
  24. 24.38 × 8 =
  25. 25.20 × 4 =
  26. 26.24 × 8 =
  27. 27.32 × 4 =
  28. 28.74 × 4 =
  29. 29.14 × 4 =
  30. 30.13 × 8 =
  31. 31.17 × 8 =
  32. 32.12 × 4 =
  33. 33.31 × 4 =
  34. 34.25 × 4 =
  35. 35.30 × 8 =
  36. 36.15 × 8 =
  37. 37.34 × 8 =
  38. 38.15 × 4 =
  39. 39.32 × 8 =
  40. 40.48 × 4 =

Answer key

  1. 152
  2. 296
  3. 52
  4. 148
  5. 292
  6. 288
  7. 228
  8. 164
  9. 176
  10. 76
  11. 320
  12. 200
  13. 160
  14. 272
  15. 240
  16. 280
  17. 288
  18. 264
  19. 188
  20. 312
  21. 112
  22. 144
  23. 184
  24. 304
  25. 80
  26. 192
  27. 128
  28. 296
  29. 56
  30. 104
  31. 136
  32. 48
  33. 124
  34. 100
  35. 240
  36. 120
  37. 272
  38. 60
  39. 256
  40. 192

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