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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 946 · 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. 2.40 × 8 =
  3. 3.67 × 4 =
  4. 4.16 × 8 =
  5. 5.62 × 4 =
  6. 6.63 × 4 =
  7. 7.15 × 4 =
  8. 8.19 × 4 =
  9. 9.37 × 8 =
  10. 10.29 × 8 =
  11. 11.23 × 4 =
  12. 12.30 × 8 =
  13. 13.12 × 8 =
  14. 14.19 × 8 =
  15. 15.53 × 4 =
  16. 16.26 × 8 =
  17. 17.24 × 8 =
  18. 18.51 × 4 =
  19. 19.25 × 8 =
  20. 20.13 × 4 =
  21. 21.35 × 4 =
  22. 22.75 × 4 =
  23. 23.32 × 4 =
  24. 24.34 × 8 =
  25. 25.27 × 4 =
  26. 26.34 × 4 =
  27. 27.46 × 4 =
  28. 28.28 × 8 =
  29. 29.39 × 8 =
  30. 30.66 × 4 =
  31. 31.27 × 8 =
  32. 32.71 × 4 =
  33. 33.59 × 4 =
  34. 34.55 × 4 =
  35. 35.15 × 8 =
  36. 36.17 × 8 =
  37. 37.31 × 4 =
  38. 38.37 × 4 =
  39. 39.23 × 8 =
  40. 40.13 × 8 =

Answer key

  1. 256
  2. 320
  3. 268
  4. 128
  5. 248
  6. 252
  7. 60
  8. 76
  9. 296
  10. 232
  11. 92
  12. 240
  13. 96
  14. 152
  15. 212
  16. 208
  17. 192
  18. 204
  19. 200
  20. 52
  21. 140
  22. 300
  23. 128
  24. 272
  25. 108
  26. 136
  27. 184
  28. 224
  29. 312
  30. 264
  31. 216
  32. 284
  33. 236
  34. 220
  35. 120
  36. 136
  37. 124
  38. 148
  39. 184
  40. 104

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