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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 849 · 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. 1.14 × 8 =
  2. 2.27 × 8 =
  3. 3.69 × 4 =
  4. 4.64 × 4 =
  5. 5.28 × 8 =
  6. 6.22 × 4 =
  7. 7.15 × 4 =
  8. 8.49 × 4 =
  9. 9.20 × 4 =
  10. 10.21 × 8 =
  11. 11.51 × 4 =
  12. 12.33 × 4 =
  13. 13.13 × 4 =
  14. 14.67 × 4 =
  15. 15.75 × 4 =
  16. 16.12 × 8 =
  17. 17.58 × 4 =
  18. 18.57 × 4 =
  19. 19.24 × 4 =
  20. 20.31 × 4 =
  21. 21.26 × 8 =
  22. 22.44 × 4 =
  23. 23.40 × 8 =
  24. 24.25 × 4 =
  25. 25.15 × 8 =
  26. 26.20 × 8 =
  27. 27.60 × 4 =
  28. 28.34 × 8 =
  29. 29.13 × 8 =
  30. 30.19 × 8 =
  31. 31.71 × 4 =
  32. 32.28 × 4 =
  33. 33.55 × 4 =
  34. 34.54 × 4 =
  35. 35.23 × 4 =
  36. 36.52 × 4 =
  37. 37.46 × 4 =
  38. 38.17 × 4 =
  39. 39.27 × 4 =
  40. 40.32 × 8 =

Answer key

  1. 112
  2. 216
  3. 276
  4. 256
  5. 224
  6. 88
  7. 60
  8. 196
  9. 80
  10. 168
  11. 204
  12. 132
  13. 52
  14. 268
  15. 300
  16. 96
  17. 232
  18. 228
  19. 96
  20. 124
  21. 208
  22. 176
  23. 320
  24. 100
  25. 120
  26. 160
  27. 240
  28. 272
  29. 104
  30. 152
  31. 284
  32. 112
  33. 220
  34. 216
  35. 92
  36. 208
  37. 184
  38. 68
  39. 108
  40. 256

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