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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 735 · 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. 1.39 × 8 =
  2. 2.33 × 8 =
  3. 3.30 × 4 =
  4. 4.21 × 4 =
  5. 5.32 × 8 =
  6. 6.23 × 8 =
  7. 7.39 × 4 =
  8. 8.32 × 4 =
  9. 9.14 × 8 =
  10. 10.40 × 4 =
  11. 11.20 × 4 =
  12. 12.73 × 4 =
  13. 13.20 × 8 =
  14. 14.18 × 8 =
  15. 15.24 × 8 =
  16. 16.13 × 8 =
  17. 17.34 × 8 =
  18. 18.74 × 4 =
  19. 19.15 × 8 =
  20. 20.66 × 4 =
  21. 21.36 × 4 =
  22. 22.12 × 4 =
  23. 23.68 × 4 =
  24. 24.34 × 4 =
  25. 25.57 × 4 =
  26. 26.19 × 4 =
  27. 27.18 × 4 =
  28. 28.72 × 4 =
  29. 29.41 × 4 =
  30. 30.19 × 8 =
  31. 31.65 × 4 =
  32. 32.12 × 8 =
  33. 33.40 × 8 =
  34. 34.52 × 4 =
  35. 35.43 × 4 =
  36. 36.16 × 4 =
  37. 37.22 × 8 =
  38. 38.62 × 4 =
  39. 39.48 × 4 =
  40. 40.26 × 4 =

Answer key

  1. 312
  2. 264
  3. 120
  4. 84
  5. 256
  6. 184
  7. 156
  8. 128
  9. 112
  10. 160
  11. 80
  12. 292
  13. 160
  14. 144
  15. 192
  16. 104
  17. 272
  18. 296
  19. 120
  20. 264
  21. 144
  22. 48
  23. 272
  24. 136
  25. 228
  26. 76
  27. 72
  28. 288
  29. 164
  30. 152
  31. 260
  32. 96
  33. 320
  34. 208
  35. 172
  36. 64
  37. 176
  38. 248
  39. 192
  40. 104

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