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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 716 · 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. 1.34 × 8 =
  2. 2.40 × 8 =
  3. 3.15 × 8 =
  4. 4.21 × 4 =
  5. 5.31 × 8 =
  6. 6.27 × 4 =
  7. 7.23 × 4 =
  8. 8.32 × 8 =
  9. 9.39 × 4 =
  10. 10.38 × 8 =
  11. 11.22 × 8 =
  12. 12.60 × 4 =
  13. 13.20 × 4 =
  14. 14.75 × 4 =
  15. 15.26 × 4 =
  16. 16.62 × 4 =
  17. 17.63 × 4 =
  18. 18.44 × 4 =
  19. 19.22 × 4 =
  20. 20.25 × 8 =
  21. 21.12 × 4 =
  22. 22.28 × 4 =
  23. 23.53 × 4 =
  24. 24.30 × 4 =
  25. 25.36 × 8 =
  26. 26.70 × 4 =
  27. 27.57 × 4 =
  28. 28.65 × 4 =
  29. 29.64 × 4 =
  30. 30.25 × 4 =
  31. 31.17 × 8 =
  32. 32.19 × 8 =
  33. 33.35 × 4 =
  34. 34.13 × 8 =
  35. 35.45 × 4 =
  36. 36.12 × 8 =
  37. 37.35 × 8 =
  38. 38.58 × 4 =
  39. 39.26 × 8 =
  40. 40.18 × 8 =

Answer key

  1. 272
  2. 320
  3. 120
  4. 84
  5. 248
  6. 108
  7. 92
  8. 256
  9. 156
  10. 304
  11. 176
  12. 240
  13. 80
  14. 300
  15. 104
  16. 248
  17. 252
  18. 176
  19. 88
  20. 200
  21. 48
  22. 112
  23. 212
  24. 120
  25. 288
  26. 280
  27. 228
  28. 260
  29. 256
  30. 100
  31. 136
  32. 152
  33. 140
  34. 104
  35. 180
  36. 96
  37. 280
  38. 232
  39. 208
  40. 144

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