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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 711 · 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. 1.69 × 4 =
  2. 2.40 × 8 =
  3. 3.32 × 4 =
  4. 4.21 × 4 =
  5. 5.40 × 4 =
  6. 6.23 × 4 =
  7. 7.34 × 8 =
  8. 8.13 × 8 =
  9. 9.20 × 8 =
  10. 10.73 × 4 =
  11. 11.30 × 8 =
  12. 12.16 × 4 =
  13. 13.42 × 4 =
  14. 14.15 × 4 =
  15. 15.56 × 4 =
  16. 16.57 × 4 =
  17. 17.25 × 4 =
  18. 18.18 × 8 =
  19. 19.19 × 8 =
  20. 20.45 × 4 =
  21. 21.36 × 8 =
  22. 22.26 × 8 =
  23. 23.12 × 4 =
  24. 24.68 × 4 =
  25. 25.35 × 8 =
  26. 26.46 × 4 =
  27. 27.21 × 8 =
  28. 28.39 × 4 =
  29. 29.25 × 8 =
  30. 30.37 × 8 =
  31. 31.28 × 4 =
  32. 32.41 × 4 =
  33. 33.34 × 4 =
  34. 34.51 × 4 =
  35. 35.33 × 8 =
  36. 36.32 × 8 =
  37. 37.43 × 4 =
  38. 38.28 × 8 =
  39. 39.15 × 8 =
  40. 40.61 × 4 =

Answer key

  1. 276
  2. 320
  3. 128
  4. 84
  5. 160
  6. 92
  7. 272
  8. 104
  9. 160
  10. 292
  11. 240
  12. 64
  13. 168
  14. 60
  15. 224
  16. 228
  17. 100
  18. 144
  19. 152
  20. 180
  21. 288
  22. 208
  23. 48
  24. 272
  25. 280
  26. 184
  27. 168
  28. 156
  29. 200
  30. 296
  31. 112
  32. 164
  33. 136
  34. 204
  35. 264
  36. 256
  37. 172
  38. 224
  39. 120
  40. 244

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