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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 513 · 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. 1.27 × 4 =
  2. 2.39 × 8 =
  3. 3.27 × 8 =
  4. 4.29 × 4 =
  5. 5.12 × 4 =
  6. 6.20 × 8 =
  7. 7.69 × 4 =
  8. 8.48 × 4 =
  9. 9.26 × 4 =
  10. 10.35 × 8 =
  11. 11.41 × 4 =
  12. 12.14 × 8 =
  13. 13.24 × 4 =
  14. 14.36 × 8 =
  15. 15.30 × 4 =
  16. 16.28 × 8 =
  17. 17.15 × 4 =
  18. 18.33 × 8 =
  19. 19.12 × 8 =
  20. 20.22 × 8 =
  21. 21.17 × 8 =
  22. 22.28 × 4 =
  23. 23.34 × 4 =
  24. 24.25 × 4 =
  25. 25.68 × 4 =
  26. 26.51 × 4 =
  27. 27.18 × 8 =
  28. 28.23 × 8 =
  29. 29.74 × 4 =
  30. 30.66 × 4 =
  31. 31.56 × 4 =
  32. 32.43 × 4 =
  33. 33.40 × 8 =
  34. 34.19 × 4 =
  35. 35.14 × 4 =
  36. 36.24 × 8 =
  37. 37.42 × 4 =
  38. 38.75 × 4 =
  39. 39.30 × 8 =
  40. 40.44 × 4 =

Answer key

  1. 108
  2. 312
  3. 216
  4. 116
  5. 48
  6. 160
  7. 276
  8. 192
  9. 104
  10. 280
  11. 164
  12. 112
  13. 96
  14. 288
  15. 120
  16. 224
  17. 60
  18. 264
  19. 96
  20. 176
  21. 136
  22. 112
  23. 136
  24. 100
  25. 272
  26. 204
  27. 144
  28. 184
  29. 296
  30. 264
  31. 224
  32. 172
  33. 320
  34. 76
  35. 56
  36. 192
  37. 168
  38. 300
  39. 240
  40. 176

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