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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 320 · 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. 2.30 × 8 =
  3. 3.31 × 8 =
  4. 4.34 × 8 =
  5. 5.17 × 4 =
  6. 6.27 × 8 =
  7. 7.32 × 4 =
  8. 8.15 × 8 =
  9. 9.13 × 8 =
  10. 10.32 × 8 =
  11. 11.13 × 4 =
  12. 12.15 × 4 =
  13. 13.14 × 8 =
  14. 14.72 × 4 =
  15. 15.31 × 4 =
  16. 16.40 × 8 =
  17. 17.35 × 8 =
  18. 18.20 × 8 =
  19. 19.35 × 4 =
  20. 20.40 × 4 =
  21. 21.39 × 8 =
  22. 22.56 × 4 =
  23. 23.41 × 4 =
  24. 24.22 × 8 =
  25. 25.29 × 8 =
  26. 26.27 × 4 =
  27. 27.49 × 4 =
  28. 28.28 × 8 =
  29. 29.26 × 4 =
  30. 30.34 × 4 =
  31. 31.38 × 8 =
  32. 32.17 × 8 =
  33. 33.25 × 8 =
  34. 34.33 × 8 =
  35. 35.25 × 4 =
  36. 36.20 × 4 =
  37. 37.12 × 4 =
  38. 38.74 × 4 =
  39. 39.37 × 8 =
  40. 40.36 × 8 =

Answer key

  1. 276
  2. 240
  3. 248
  4. 272
  5. 68
  6. 216
  7. 128
  8. 120
  9. 104
  10. 256
  11. 52
  12. 60
  13. 112
  14. 288
  15. 124
  16. 320
  17. 280
  18. 160
  19. 140
  20. 160
  21. 312
  22. 224
  23. 164
  24. 176
  25. 232
  26. 108
  27. 196
  28. 224
  29. 104
  30. 136
  31. 304
  32. 136
  33. 200
  34. 264
  35. 100
  36. 80
  37. 48
  38. 296
  39. 296
  40. 288

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