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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 866 · 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. 1.18 × 8 =
  2. 2.12 × 4 =
  3. 3.46 × 4 =
  4. 4.28 × 4 =
  5. 5.17 × 4 =
  6. 6.68 × 4 =
  7. 7.16 × 4 =
  8. 8.33 × 8 =
  9. 9.58 × 4 =
  10. 10.40 × 8 =
  11. 11.30 × 4 =
  12. 12.75 × 4 =
  13. 13.36 × 4 =
  14. 14.29 × 8 =
  15. 15.22 × 4 =
  16. 16.45 × 4 =
  17. 17.20 × 8 =
  18. 18.12 × 8 =
  19. 19.26 × 8 =
  20. 20.23 × 8 =
  21. 21.38 × 8 =
  22. 22.32 × 8 =
  23. 23.14 × 4 =
  24. 24.28 × 8 =
  25. 25.51 × 4 =
  26. 26.13 × 8 =
  27. 27.63 × 4 =
  28. 28.31 × 4 =
  29. 29.21 × 4 =
  30. 30.37 × 8 =
  31. 31.35 × 8 =
  32. 32.25 × 8 =
  33. 33.19 × 8 =
  34. 34.15 × 8 =
  35. 35.47 × 4 =
  36. 36.34 × 4 =
  37. 37.31 × 8 =
  38. 38.40 × 4 =
  39. 39.34 × 8 =
  40. 40.20 × 4 =

Answer key

  1. 144
  2. 48
  3. 184
  4. 112
  5. 68
  6. 272
  7. 64
  8. 264
  9. 232
  10. 320
  11. 120
  12. 300
  13. 144
  14. 232
  15. 88
  16. 180
  17. 160
  18. 96
  19. 208
  20. 184
  21. 304
  22. 256
  23. 56
  24. 224
  25. 204
  26. 104
  27. 252
  28. 124
  29. 84
  30. 296
  31. 280
  32. 200
  33. 152
  34. 120
  35. 188
  36. 136
  37. 248
  38. 160
  39. 272
  40. 80

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