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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 781 · 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. 1.40 × 8 =
  2. 2.14 × 8 =
  3. 3.39 × 8 =
  4. 4.42 × 4 =
  5. 5.16 × 8 =
  6. 6.21 × 8 =
  7. 7.36 × 8 =
  8. 8.60 × 4 =
  9. 9.46 × 4 =
  10. 10.44 × 4 =
  11. 11.18 × 4 =
  12. 12.58 × 4 =
  13. 13.17 × 4 =
  14. 14.15 × 8 =
  15. 15.27 × 8 =
  16. 16.24 × 8 =
  17. 17.31 × 8 =
  18. 18.48 × 4 =
  19. 19.28 × 4 =
  20. 20.35 × 8 =
  21. 21.25 × 8 =
  22. 22.29 × 4 =
  23. 23.38 × 4 =
  24. 24.31 × 4 =
  25. 25.22 × 8 =
  26. 26.32 × 8 =
  27. 27.12 × 8 =
  28. 28.14 × 4 =
  29. 29.43 × 4 =
  30. 30.20 × 8 =
  31. 31.23 × 8 =
  32. 32.30 × 4 =
  33. 33.74 × 4 =
  34. 34.37 × 8 =
  35. 35.19 × 4 =
  36. 36.30 × 8 =
  37. 37.55 × 4 =
  38. 38.17 × 8 =
  39. 39.33 × 4 =
  40. 40.72 × 4 =

Answer key

  1. 320
  2. 112
  3. 312
  4. 168
  5. 128
  6. 168
  7. 288
  8. 240
  9. 184
  10. 176
  11. 72
  12. 232
  13. 68
  14. 120
  15. 216
  16. 192
  17. 248
  18. 192
  19. 112
  20. 280
  21. 200
  22. 116
  23. 152
  24. 124
  25. 176
  26. 256
  27. 96
  28. 56
  29. 172
  30. 160
  31. 184
  32. 120
  33. 296
  34. 296
  35. 76
  36. 240
  37. 220
  38. 136
  39. 132
  40. 288

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