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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 850 · 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. 1.13 × 8 =
  2. 2.34 × 8 =
  3. 3.23 × 4 =
  4. 4.32 × 8 =
  5. 5.27 × 8 =
  6. 6.57 × 4 =
  7. 7.22 × 8 =
  8. 8.42 × 4 =
  9. 9.19 × 4 =
  10. 10.21 × 4 =
  11. 11.35 × 8 =
  12. 12.37 × 8 =
  13. 13.54 × 4 =
  14. 14.19 × 8 =
  15. 15.64 × 4 =
  16. 16.38 × 8 =
  17. 17.18 × 4 =
  18. 18.23 × 8 =
  19. 19.17 × 4 =
  20. 20.46 × 4 =
  21. 21.14 × 4 =
  22. 22.44 × 4 =
  23. 23.20 × 4 =
  24. 24.66 × 4 =
  25. 25.18 × 8 =
  26. 26.25 × 4 =
  27. 27.33 × 4 =
  28. 28.39 × 8 =
  29. 29.43 × 4 =
  30. 30.17 × 8 =
  31. 31.32 × 4 =
  32. 32.36 × 8 =
  33. 33.75 × 4 =
  34. 34.25 × 8 =
  35. 35.62 × 4 =
  36. 36.28 × 8 =
  37. 37.29 × 4 =
  38. 38.56 × 4 =
  39. 39.73 × 4 =
  40. 40.12 × 8 =

Answer key

  1. 104
  2. 272
  3. 92
  4. 256
  5. 216
  6. 228
  7. 176
  8. 168
  9. 76
  10. 84
  11. 280
  12. 296
  13. 216
  14. 152
  15. 256
  16. 304
  17. 72
  18. 184
  19. 68
  20. 184
  21. 56
  22. 176
  23. 80
  24. 264
  25. 144
  26. 100
  27. 132
  28. 312
  29. 172
  30. 136
  31. 128
  32. 288
  33. 300
  34. 200
  35. 248
  36. 224
  37. 116
  38. 224
  39. 292
  40. 96

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