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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 415 · 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. 1.70 × 4 =
  2. 2.57 × 4 =
  3. 3.34 × 4 =
  4. 4.13 × 8 =
  5. 5.12 × 4 =
  6. 6.22 × 8 =
  7. 7.48 × 4 =
  8. 8.58 × 4 =
  9. 9.30 × 4 =
  10. 10.14 × 4 =
  11. 11.29 × 4 =
  12. 12.12 × 8 =
  13. 13.39 × 8 =
  14. 14.26 × 8 =
  15. 15.33 × 4 =
  16. 16.28 × 8 =
  17. 17.25 × 8 =
  18. 18.73 × 4 =
  19. 19.27 × 4 =
  20. 20.35 × 4 =
  21. 21.52 × 4 =
  22. 22.18 × 8 =
  23. 23.17 × 8 =
  24. 24.66 × 4 =
  25. 25.28 × 4 =
  26. 26.59 × 4 =
  27. 27.15 × 8 =
  28. 28.16 × 4 =
  29. 29.45 × 4 =
  30. 30.32 × 8 =
  31. 31.62 × 4 =
  32. 32.19 × 8 =
  33. 33.29 × 8 =
  34. 34.50 × 4 =
  35. 35.75 × 4 =
  36. 36.21 × 4 =
  37. 37.69 × 4 =
  38. 38.24 × 8 =
  39. 39.40 × 4 =
  40. 40.64 × 4 =

Answer key

  1. 280
  2. 228
  3. 136
  4. 104
  5. 48
  6. 176
  7. 192
  8. 232
  9. 120
  10. 56
  11. 116
  12. 96
  13. 312
  14. 208
  15. 132
  16. 224
  17. 200
  18. 292
  19. 108
  20. 140
  21. 208
  22. 144
  23. 136
  24. 264
  25. 112
  26. 236
  27. 120
  28. 64
  29. 180
  30. 256
  31. 248
  32. 152
  33. 232
  34. 200
  35. 300
  36. 84
  37. 276
  38. 192
  39. 160
  40. 256

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