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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 828 · 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. 1.32 × 8 =
  2. 2.30 × 8 =
  3. 3.23 × 4 =
  4. 4.37 × 8 =
  5. 5.45 × 4 =
  6. 6.16 × 8 =
  7. 7.15 × 4 =
  8. 8.31 × 8 =
  9. 9.70 × 4 =
  10. 10.71 × 4 =
  11. 11.67 × 4 =
  12. 12.61 × 4 =
  13. 13.56 × 4 =
  14. 14.18 × 4 =
  15. 15.17 × 8 =
  16. 16.16 × 4 =
  17. 17.19 × 8 =
  18. 18.22 × 4 =
  19. 19.57 × 4 =
  20. 20.34 × 8 =
  21. 21.27 × 4 =
  22. 22.14 × 8 =
  23. 23.29 × 8 =
  24. 24.47 × 4 =
  25. 25.20 × 4 =
  26. 26.74 × 4 =
  27. 27.17 × 4 =
  28. 28.33 × 8 =
  29. 29.15 × 8 =
  30. 30.24 × 8 =
  31. 31.41 × 4 =
  32. 32.40 × 4 =
  33. 33.26 × 4 =
  34. 34.39 × 8 =
  35. 35.12 × 8 =
  36. 36.58 × 4 =
  37. 37.13 × 8 =
  38. 38.35 × 8 =
  39. 39.51 × 4 =
  40. 40.20 × 8 =

Answer key

  1. 256
  2. 240
  3. 92
  4. 296
  5. 180
  6. 128
  7. 60
  8. 248
  9. 280
  10. 284
  11. 268
  12. 244
  13. 224
  14. 72
  15. 136
  16. 64
  17. 152
  18. 88
  19. 228
  20. 272
  21. 108
  22. 112
  23. 232
  24. 188
  25. 80
  26. 296
  27. 68
  28. 264
  29. 120
  30. 192
  31. 164
  32. 160
  33. 104
  34. 312
  35. 96
  36. 232
  37. 104
  38. 280
  39. 204
  40. 160

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