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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 780 · 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. 1.40 × 8 =
  2. 2.67 × 4 =
  3. 3.26 × 8 =
  4. 4.28 × 4 =
  5. 5.28 × 8 =
  6. 6.14 × 4 =
  7. 7.45 × 4 =
  8. 8.34 × 4 =
  9. 9.12 × 8 =
  10. 10.16 × 4 =
  11. 11.32 × 8 =
  12. 12.15 × 8 =
  13. 13.17 × 4 =
  14. 14.30 × 8 =
  15. 15.56 × 4 =
  16. 16.33 × 8 =
  17. 17.44 × 4 =
  18. 18.18 × 8 =
  19. 19.19 × 8 =
  20. 20.34 × 8 =
  21. 21.47 × 4 =
  22. 22.42 × 4 =
  23. 23.73 × 4 =
  24. 24.18 × 4 =
  25. 25.68 × 4 =
  26. 26.17 × 8 =
  27. 27.15 × 4 =
  28. 28.27 × 4 =
  29. 29.26 × 4 =
  30. 30.60 × 4 =
  31. 31.39 × 8 =
  32. 32.70 × 4 =
  33. 33.39 × 4 =
  34. 34.13 × 8 =
  35. 35.35 × 8 =
  36. 36.23 × 4 =
  37. 37.33 × 4 =
  38. 38.22 × 4 =
  39. 39.24 × 8 =
  40. 40.24 × 4 =

Answer key

  1. 320
  2. 268
  3. 208
  4. 112
  5. 224
  6. 56
  7. 180
  8. 136
  9. 96
  10. 64
  11. 256
  12. 120
  13. 68
  14. 240
  15. 224
  16. 264
  17. 176
  18. 144
  19. 152
  20. 272
  21. 188
  22. 168
  23. 292
  24. 72
  25. 272
  26. 136
  27. 60
  28. 108
  29. 104
  30. 240
  31. 312
  32. 280
  33. 156
  34. 104
  35. 280
  36. 92
  37. 132
  38. 88
  39. 192
  40. 96

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