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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 189 · 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. 1.34 × 4 =
  2. 2.20 × 8 =
  3. 3.12 × 4 =
  4. 4.17 × 8 =
  5. 5.66 × 4 =
  6. 6.18 × 8 =
  7. 7.35 × 8 =
  8. 8.13 × 4 =
  9. 9.13 × 8 =
  10. 10.33 × 8 =
  11. 11.64 × 4 =
  12. 12.16 × 4 =
  13. 13.70 × 4 =
  14. 14.39 × 4 =
  15. 15.22 × 4 =
  16. 16.36 × 8 =
  17. 17.16 × 8 =
  18. 18.55 × 4 =
  19. 19.34 × 8 =
  20. 20.12 × 8 =
  21. 21.53 × 4 =
  22. 22.30 × 8 =
  23. 23.58 × 4 =
  24. 24.28 × 8 =
  25. 25.37 × 8 =
  26. 26.29 × 8 =
  27. 27.51 × 4 =
  28. 28.25 × 8 =
  29. 29.57 × 4 =
  30. 30.52 × 4 =
  31. 31.46 × 4 =
  32. 32.35 × 4 =
  33. 33.25 × 4 =
  34. 34.17 × 4 =
  35. 35.31 × 4 =
  36. 36.42 × 4 =
  37. 37.40 × 8 =
  38. 38.21 × 4 =
  39. 39.27 × 4 =
  40. 40.59 × 4 =

Answer key

  1. 136
  2. 160
  3. 48
  4. 136
  5. 264
  6. 144
  7. 280
  8. 52
  9. 104
  10. 264
  11. 256
  12. 64
  13. 280
  14. 156
  15. 88
  16. 288
  17. 128
  18. 220
  19. 272
  20. 96
  21. 212
  22. 240
  23. 232
  24. 224
  25. 296
  26. 232
  27. 204
  28. 200
  29. 228
  30. 208
  31. 184
  32. 140
  33. 100
  34. 68
  35. 124
  36. 168
  37. 320
  38. 84
  39. 108
  40. 236

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