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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 729 · 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. 1.55 × 4 =
  2. 2.28 × 8 =
  3. 3.18 × 4 =
  4. 4.72 × 4 =
  5. 5.14 × 4 =
  6. 6.32 × 4 =
  7. 7.25 × 8 =
  8. 8.69 × 4 =
  9. 9.15 × 4 =
  10. 10.17 × 8 =
  11. 11.50 × 4 =
  12. 12.30 × 4 =
  13. 13.23 × 4 =
  14. 14.13 × 8 =
  15. 15.17 × 4 =
  16. 16.64 × 4 =
  17. 17.13 × 4 =
  18. 18.70 × 4 =
  19. 19.68 × 4 =
  20. 20.34 × 8 =
  21. 21.62 × 4 =
  22. 22.51 × 4 =
  23. 23.66 × 4 =
  24. 24.16 × 8 =
  25. 25.31 × 4 =
  26. 26.40 × 8 =
  27. 27.73 × 4 =
  28. 28.21 × 4 =
  29. 29.14 × 8 =
  30. 30.57 × 4 =
  31. 31.67 × 4 =
  32. 32.60 × 4 =
  33. 33.15 × 8 =
  34. 34.22 × 4 =
  35. 35.52 × 4 =
  36. 36.36 × 4 =
  37. 37.58 × 4 =
  38. 38.33 × 4 =
  39. 39.39 × 8 =
  40. 40.20 × 8 =

Answer key

  1. 220
  2. 224
  3. 72
  4. 288
  5. 56
  6. 128
  7. 200
  8. 276
  9. 60
  10. 136
  11. 200
  12. 120
  13. 92
  14. 104
  15. 68
  16. 256
  17. 52
  18. 280
  19. 272
  20. 272
  21. 248
  22. 204
  23. 264
  24. 128
  25. 124
  26. 320
  27. 292
  28. 84
  29. 112
  30. 228
  31. 268
  32. 240
  33. 120
  34. 88
  35. 208
  36. 144
  37. 232
  38. 132
  39. 312
  40. 160

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