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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 139 · 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. 1.39 × 4 =
  2. 2.38 × 8 =
  3. 3.24 × 4 =
  4. 4.39 × 8 =
  5. 5.15 × 8 =
  6. 6.71 × 4 =
  7. 7.35 × 8 =
  8. 8.35 × 4 =
  9. 9.17 × 8 =
  10. 10.21 × 8 =
  11. 11.32 × 8 =
  12. 12.66 × 4 =
  13. 13.12 × 8 =
  14. 14.50 × 4 =
  15. 15.20 × 8 =
  16. 16.27 × 8 =
  17. 17.22 × 4 =
  18. 18.33 × 4 =
  19. 19.29 × 8 =
  20. 20.23 × 4 =
  21. 21.14 × 8 =
  22. 22.12 × 4 =
  23. 23.17 × 4 =
  24. 24.13 × 8 =
  25. 25.74 × 4 =
  26. 26.40 × 8 =
  27. 27.14 × 4 =
  28. 28.16 × 8 =
  29. 29.25 × 8 =
  30. 30.51 × 4 =
  31. 31.26 × 8 =
  32. 32.64 × 4 =
  33. 33.61 × 4 =
  34. 34.24 × 8 =
  35. 35.69 × 4 =
  36. 36.60 × 4 =
  37. 37.56 × 4 =
  38. 38.45 × 4 =
  39. 39.32 × 4 =
  40. 40.27 × 4 =

Answer key

  1. 156
  2. 304
  3. 96
  4. 312
  5. 120
  6. 284
  7. 280
  8. 140
  9. 136
  10. 168
  11. 256
  12. 264
  13. 96
  14. 200
  15. 160
  16. 216
  17. 88
  18. 132
  19. 232
  20. 92
  21. 112
  22. 48
  23. 68
  24. 104
  25. 296
  26. 320
  27. 56
  28. 128
  29. 200
  30. 204
  31. 208
  32. 256
  33. 244
  34. 192
  35. 276
  36. 240
  37. 224
  38. 180
  39. 128
  40. 108

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