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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 643 · 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. 1.21 × 4 =
  2. 2.61 × 4 =
  3. 3.73 × 4 =
  4. 4.19 × 8 =
  5. 5.21 × 8 =
  6. 6.17 × 8 =
  7. 7.24 × 4 =
  8. 8.18 × 4 =
  9. 9.33 × 8 =
  10. 10.30 × 8 =
  11. 11.14 × 4 =
  12. 12.44 × 4 =
  13. 13.70 × 4 =
  14. 14.24 × 8 =
  15. 15.39 × 8 =
  16. 16.29 × 8 =
  17. 17.28 × 8 =
  18. 18.71 × 4 =
  19. 19.27 × 8 =
  20. 20.12 × 8 =
  21. 21.56 × 4 =
  22. 22.50 × 4 =
  23. 23.32 × 8 =
  24. 24.54 × 4 =
  25. 25.26 × 8 =
  26. 26.37 × 4 =
  27. 27.29 × 4 =
  28. 28.12 × 4 =
  29. 29.60 × 4 =
  30. 30.26 × 4 =
  31. 31.16 × 4 =
  32. 32.15 × 4 =
  33. 33.22 × 4 =
  34. 34.13 × 8 =
  35. 35.20 × 8 =
  36. 36.40 × 8 =
  37. 37.35 × 8 =
  38. 38.25 × 8 =
  39. 39.38 × 8 =
  40. 40.16 × 8 =

Answer key

  1. 84
  2. 244
  3. 292
  4. 152
  5. 168
  6. 136
  7. 96
  8. 72
  9. 264
  10. 240
  11. 56
  12. 176
  13. 280
  14. 192
  15. 312
  16. 232
  17. 224
  18. 284
  19. 216
  20. 96
  21. 224
  22. 200
  23. 256
  24. 216
  25. 208
  26. 148
  27. 116
  28. 48
  29. 240
  30. 104
  31. 64
  32. 60
  33. 88
  34. 104
  35. 160
  36. 320
  37. 280
  38. 200
  39. 304
  40. 128

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