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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 824 · 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 × 8 =
  2. 2.29 × 8 =
  3. 3.52 × 4 =
  4. 4.26 × 8 =
  5. 5.12 × 8 =
  6. 6.19 × 8 =
  7. 7.71 × 4 =
  8. 8.31 × 8 =
  9. 9.55 × 4 =
  10. 10.20 × 4 =
  11. 11.20 × 8 =
  12. 12.37 × 8 =
  13. 13.30 × 8 =
  14. 14.27 × 4 =
  15. 15.15 × 8 =
  16. 16.34 × 4 =
  17. 17.47 × 4 =
  18. 18.27 × 8 =
  19. 19.33 × 4 =
  20. 20.16 × 4 =
  21. 21.36 × 8 =
  22. 22.70 × 4 =
  23. 23.73 × 4 =
  24. 24.13 × 8 =
  25. 25.53 × 4 =
  26. 26.44 × 4 =
  27. 27.13 × 4 =
  28. 28.25 × 4 =
  29. 29.34 × 8 =
  30. 30.63 × 4 =
  31. 31.36 × 4 =
  32. 32.30 × 4 =
  33. 33.23 × 8 =
  34. 34.75 × 4 =
  35. 35.21 × 4 =
  36. 36.17 × 4 =
  37. 37.61 × 4 =
  38. 38.32 × 8 =
  39. 39.62 × 4 =
  40. 40.48 × 4 =

Answer key

  1. 304
  2. 232
  3. 208
  4. 208
  5. 96
  6. 152
  7. 284
  8. 248
  9. 220
  10. 80
  11. 160
  12. 296
  13. 240
  14. 108
  15. 120
  16. 136
  17. 188
  18. 216
  19. 132
  20. 64
  21. 288
  22. 280
  23. 292
  24. 104
  25. 212
  26. 176
  27. 52
  28. 100
  29. 272
  30. 252
  31. 144
  32. 120
  33. 184
  34. 300
  35. 84
  36. 68
  37. 244
  38. 256
  39. 248
  40. 192

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