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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 322 · 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. 1.33 × 4 =
  2. 2.23 × 8 =
  3. 3.20 × 8 =
  4. 4.28 × 8 =
  5. 5.13 × 8 =
  6. 6.31 × 8 =
  7. 7.35 × 4 =
  8. 8.14 × 8 =
  9. 9.45 × 4 =
  10. 10.18 × 8 =
  11. 11.36 × 4 =
  12. 12.26 × 4 =
  13. 13.30 × 8 =
  14. 14.17 × 4 =
  15. 15.63 × 4 =
  16. 16.28 × 4 =
  17. 17.20 × 4 =
  18. 18.74 × 4 =
  19. 19.33 × 8 =
  20. 20.70 × 4 =
  21. 21.29 × 8 =
  22. 22.25 × 4 =
  23. 23.75 × 4 =
  24. 24.32 × 8 =
  25. 25.21 × 8 =
  26. 26.22 × 4 =
  27. 27.72 × 4 =
  28. 28.44 × 4 =
  29. 29.26 × 8 =
  30. 30.22 × 8 =
  31. 31.66 × 4 =
  32. 32.16 × 8 =
  33. 33.41 × 4 =
  34. 34.27 × 8 =
  35. 35.15 × 8 =
  36. 36.39 × 8 =
  37. 37.53 × 4 =
  38. 38.19 × 8 =
  39. 39.19 × 4 =
  40. 40.54 × 4 =

Answer key

  1. 132
  2. 184
  3. 160
  4. 224
  5. 104
  6. 248
  7. 140
  8. 112
  9. 180
  10. 144
  11. 144
  12. 104
  13. 240
  14. 68
  15. 252
  16. 112
  17. 80
  18. 296
  19. 264
  20. 280
  21. 232
  22. 100
  23. 300
  24. 256
  25. 168
  26. 88
  27. 288
  28. 176
  29. 208
  30. 176
  31. 264
  32. 128
  33. 164
  34. 216
  35. 120
  36. 312
  37. 212
  38. 152
  39. 76
  40. 216

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