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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 91 · 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. 1.19 × 4 =
  2. 2.40 × 8 =
  3. 3.34 × 8 =
  4. 4.27 × 8 =
  5. 5.29 × 8 =
  6. 6.27 × 4 =
  7. 7.25 × 8 =
  8. 8.37 × 8 =
  9. 9.24 × 4 =
  10. 10.20 × 4 =
  11. 11.15 × 4 =
  12. 12.20 × 8 =
  13. 13.49 × 4 =
  14. 14.75 × 4 =
  15. 15.38 × 8 =
  16. 16.23 × 4 =
  17. 17.14 × 4 =
  18. 18.17 × 8 =
  19. 19.68 × 4 =
  20. 20.53 × 4 =
  21. 21.36 × 8 =
  22. 22.40 × 4 =
  23. 23.65 × 4 =
  24. 24.22 × 8 =
  25. 25.18 × 4 =
  26. 26.21 × 8 =
  27. 27.50 × 4 =
  28. 28.54 × 4 =
  29. 29.26 × 8 =
  30. 30.33 × 8 =
  31. 31.35 × 8 =
  32. 32.19 × 8 =
  33. 33.66 × 4 =
  34. 34.28 × 4 =
  35. 35.70 × 4 =
  36. 36.12 × 8 =
  37. 37.30 × 8 =
  38. 38.55 × 4 =
  39. 39.12 × 4 =
  40. 40.16 × 4 =

Answer key

  1. 76
  2. 320
  3. 272
  4. 216
  5. 232
  6. 108
  7. 200
  8. 296
  9. 96
  10. 80
  11. 60
  12. 160
  13. 196
  14. 300
  15. 304
  16. 92
  17. 56
  18. 136
  19. 272
  20. 212
  21. 288
  22. 160
  23. 260
  24. 176
  25. 72
  26. 168
  27. 200
  28. 216
  29. 208
  30. 264
  31. 280
  32. 152
  33. 264
  34. 112
  35. 280
  36. 96
  37. 240
  38. 220
  39. 48
  40. 64

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