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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 14 · 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. 1.16 × 8 =
  2. 2.23 × 8 =
  3. 3.12 × 8 =
  4. 4.18 × 8 =
  5. 5.16 × 4 =
  6. 6.57 × 4 =
  7. 7.33 × 4 =
  8. 8.36 × 8 =
  9. 9.31 × 4 =
  10. 10.66 × 4 =
  11. 11.70 × 4 =
  12. 12.22 × 8 =
  13. 13.13 × 4 =
  14. 14.20 × 4 =
  15. 15.25 × 8 =
  16. 16.63 × 4 =
  17. 17.19 × 4 =
  18. 18.21 × 4 =
  19. 19.68 × 4 =
  20. 20.38 × 8 =
  21. 21.50 × 4 =
  22. 22.55 × 4 =
  23. 23.17 × 4 =
  24. 24.23 × 4 =
  25. 25.74 × 4 =
  26. 26.15 × 8 =
  27. 27.39 × 8 =
  28. 28.29 × 8 =
  29. 29.37 × 4 =
  30. 30.40 × 4 =
  31. 31.53 × 4 =
  32. 32.13 × 8 =
  33. 33.17 × 8 =
  34. 34.54 × 4 =
  35. 35.34 × 4 =
  36. 36.30 × 8 =
  37. 37.26 × 8 =
  38. 38.25 × 4 =
  39. 39.15 × 4 =
  40. 40.64 × 4 =

Answer key

  1. 128
  2. 184
  3. 96
  4. 144
  5. 64
  6. 228
  7. 132
  8. 288
  9. 124
  10. 264
  11. 280
  12. 176
  13. 52
  14. 80
  15. 200
  16. 252
  17. 76
  18. 84
  19. 272
  20. 304
  21. 200
  22. 220
  23. 68
  24. 92
  25. 296
  26. 120
  27. 312
  28. 232
  29. 148
  30. 160
  31. 212
  32. 104
  33. 136
  34. 216
  35. 136
  36. 240
  37. 208
  38. 100
  39. 60
  40. 256

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