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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 392 · 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. 1.51 × 4 =
  2. 2.39 × 8 =
  3. 3.44 × 4 =
  4. 4.13 × 8 =
  5. 5.19 × 8 =
  6. 6.66 × 4 =
  7. 7.71 × 4 =
  8. 8.17 × 4 =
  9. 9.17 × 8 =
  10. 10.45 × 4 =
  11. 11.21 × 8 =
  12. 12.22 × 8 =
  13. 13.31 × 8 =
  14. 14.23 × 8 =
  15. 15.26 × 8 =
  16. 16.28 × 4 =
  17. 17.33 × 8 =
  18. 18.28 × 8 =
  19. 19.38 × 4 =
  20. 20.15 × 8 =
  21. 21.24 × 8 =
  22. 22.57 × 4 =
  23. 23.58 × 4 =
  24. 24.36 × 8 =
  25. 25.16 × 4 =
  26. 26.64 × 4 =
  27. 27.20 × 8 =
  28. 28.69 × 4 =
  29. 29.25 × 8 =
  30. 30.19 × 4 =
  31. 31.12 × 8 =
  32. 32.72 × 4 =
  33. 33.26 × 4 =
  34. 34.52 × 4 =
  35. 35.35 × 8 =
  36. 36.43 × 4 =
  37. 37.40 × 8 =
  38. 38.37 × 8 =
  39. 39.12 × 4 =
  40. 40.20 × 4 =

Answer key

  1. 204
  2. 312
  3. 176
  4. 104
  5. 152
  6. 264
  7. 284
  8. 68
  9. 136
  10. 180
  11. 168
  12. 176
  13. 248
  14. 184
  15. 208
  16. 112
  17. 264
  18. 224
  19. 152
  20. 120
  21. 192
  22. 228
  23. 232
  24. 288
  25. 64
  26. 256
  27. 160
  28. 276
  29. 200
  30. 76
  31. 96
  32. 288
  33. 104
  34. 208
  35. 280
  36. 172
  37. 320
  38. 296
  39. 48
  40. 80

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