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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 22 · 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. 1.38 × 8 =
  2. 2.13 × 8 =
  3. 3.57 × 4 =
  4. 4.12 × 4 =
  5. 5.20 × 4 =
  6. 6.31 × 4 =
  7. 7.28 × 4 =
  8. 8.21 × 4 =
  9. 9.13 × 4 =
  10. 10.14 × 8 =
  11. 11.12 × 8 =
  12. 12.51 × 4 =
  13. 13.15 × 8 =
  14. 14.23 × 8 =
  15. 15.33 × 8 =
  16. 16.32 × 8 =
  17. 17.33 × 4 =
  18. 18.68 × 4 =
  19. 19.40 × 8 =
  20. 20.50 × 4 =
  21. 21.16 × 8 =
  22. 22.18 × 4 =
  23. 23.59 × 4 =
  24. 24.75 × 4 =
  25. 25.15 × 4 =
  26. 26.37 × 8 =
  27. 27.28 × 8 =
  28. 28.43 × 4 =
  29. 29.38 × 4 =
  30. 30.26 × 4 =
  31. 31.52 × 4 =
  32. 32.73 × 4 =
  33. 33.58 × 4 =
  34. 34.47 × 4 =
  35. 35.53 × 4 =
  36. 36.25 × 4 =
  37. 37.20 × 8 =
  38. 38.41 × 4 =
  39. 39.17 × 8 =
  40. 40.56 × 4 =

Answer key

  1. 304
  2. 104
  3. 228
  4. 48
  5. 80
  6. 124
  7. 112
  8. 84
  9. 52
  10. 112
  11. 96
  12. 204
  13. 120
  14. 184
  15. 264
  16. 256
  17. 132
  18. 272
  19. 320
  20. 200
  21. 128
  22. 72
  23. 236
  24. 300
  25. 60
  26. 296
  27. 224
  28. 172
  29. 152
  30. 104
  31. 208
  32. 292
  33. 232
  34. 188
  35. 212
  36. 100
  37. 160
  38. 164
  39. 136
  40. 224

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