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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 311 · 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 × 4 =
  2. 2.40 × 8 =
  3. 3.20 × 8 =
  4. 4.15 × 4 =
  5. 5.17 × 4 =
  6. 6.30 × 4 =
  7. 7.31 × 8 =
  8. 8.32 × 8 =
  9. 9.12 × 8 =
  10. 10.26 × 4 =
  11. 11.56 × 4 =
  12. 12.60 × 4 =
  13. 13.23 × 8 =
  14. 14.55 × 4 =
  15. 15.46 × 4 =
  16. 16.24 × 4 =
  17. 17.45 × 4 =
  18. 18.70 × 4 =
  19. 19.29 × 8 =
  20. 20.28 × 4 =
  21. 21.43 × 4 =
  22. 22.61 × 4 =
  23. 23.14 × 4 =
  24. 24.74 × 4 =
  25. 25.64 × 4 =
  26. 26.50 × 4 =
  27. 27.73 × 4 =
  28. 28.24 × 8 =
  29. 29.26 × 8 =
  30. 30.57 × 4 =
  31. 31.36 × 4 =
  32. 32.44 × 4 =
  33. 33.33 × 4 =
  34. 34.13 × 4 =
  35. 35.13 × 8 =
  36. 36.18 × 8 =
  37. 37.39 × 8 =
  38. 38.69 × 4 =
  39. 39.66 × 4 =
  40. 40.15 × 8 =

Answer key

  1. 152
  2. 320
  3. 160
  4. 60
  5. 68
  6. 120
  7. 248
  8. 256
  9. 96
  10. 104
  11. 224
  12. 240
  13. 184
  14. 220
  15. 184
  16. 96
  17. 180
  18. 280
  19. 232
  20. 112
  21. 172
  22. 244
  23. 56
  24. 296
  25. 256
  26. 200
  27. 292
  28. 192
  29. 208
  30. 228
  31. 144
  32. 176
  33. 132
  34. 52
  35. 104
  36. 144
  37. 312
  38. 276
  39. 264
  40. 120

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