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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 403 · 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. 1.38 × 8 =
  2. 2.68 × 4 =
  3. 3.16 × 8 =
  4. 4.69 × 4 =
  5. 5.13 × 4 =
  6. 6.71 × 4 =
  7. 7.34 × 4 =
  8. 8.16 × 4 =
  9. 9.14 × 8 =
  10. 10.29 × 4 =
  11. 11.18 × 4 =
  12. 12.75 × 4 =
  13. 13.17 × 4 =
  14. 14.35 × 8 =
  15. 15.27 × 4 =
  16. 16.15 × 8 =
  17. 17.52 × 4 =
  18. 18.32 × 4 =
  19. 19.59 × 4 =
  20. 20.24 × 8 =
  21. 21.21 × 8 =
  22. 22.45 × 4 =
  23. 23.28 × 8 =
  24. 24.33 × 4 =
  25. 25.31 × 8 =
  26. 26.58 × 4 =
  27. 27.24 × 4 =
  28. 28.25 × 8 =
  29. 29.21 × 4 =
  30. 30.40 × 8 =
  31. 31.64 × 4 =
  32. 32.12 × 8 =
  33. 33.63 × 4 =
  34. 34.20 × 4 =
  35. 35.22 × 8 =
  36. 36.48 × 4 =
  37. 37.37 × 8 =
  38. 38.61 × 4 =
  39. 39.42 × 4 =
  40. 40.32 × 8 =

Answer key

  1. 304
  2. 272
  3. 128
  4. 276
  5. 52
  6. 284
  7. 136
  8. 64
  9. 112
  10. 116
  11. 72
  12. 300
  13. 68
  14. 280
  15. 108
  16. 120
  17. 208
  18. 128
  19. 236
  20. 192
  21. 168
  22. 180
  23. 224
  24. 132
  25. 248
  26. 232
  27. 96
  28. 200
  29. 84
  30. 320
  31. 256
  32. 96
  33. 252
  34. 80
  35. 176
  36. 192
  37. 296
  38. 244
  39. 168
  40. 256

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