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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 25 · 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. 1.43 × 4 =
  2. 2.56 × 4 =
  3. 3.23 × 8 =
  4. 4.40 × 8 =
  5. 5.17 × 8 =
  6. 6.14 × 8 =
  7. 7.24 × 4 =
  8. 8.34 × 4 =
  9. 9.22 × 8 =
  10. 10.73 × 4 =
  11. 11.26 × 8 =
  12. 12.35 × 8 =
  13. 13.30 × 4 =
  14. 14.20 × 4 =
  15. 15.66 × 4 =
  16. 16.38 × 8 =
  17. 17.40 × 4 =
  18. 18.32 × 4 =
  19. 19.13 × 4 =
  20. 20.15 × 4 =
  21. 21.31 × 4 =
  22. 22.14 × 4 =
  23. 23.16 × 4 =
  24. 24.64 × 4 =
  25. 25.45 × 4 =
  26. 26.30 × 8 =
  27. 27.58 × 4 =
  28. 28.53 × 4 =
  29. 29.18 × 8 =
  30. 30.26 × 4 =
  31. 31.12 × 8 =
  32. 32.36 × 4 =
  33. 33.29 × 4 =
  34. 34.28 × 4 =
  35. 35.31 × 8 =
  36. 36.72 × 4 =
  37. 37.21 × 8 =
  38. 38.23 × 4 =
  39. 39.13 × 8 =
  40. 40.38 × 4 =

Answer key

  1. 172
  2. 224
  3. 184
  4. 320
  5. 136
  6. 112
  7. 96
  8. 136
  9. 176
  10. 292
  11. 208
  12. 280
  13. 120
  14. 80
  15. 264
  16. 304
  17. 160
  18. 128
  19. 52
  20. 60
  21. 124
  22. 56
  23. 64
  24. 256
  25. 180
  26. 240
  27. 232
  28. 212
  29. 144
  30. 104
  31. 96
  32. 144
  33. 116
  34. 112
  35. 248
  36. 288
  37. 168
  38. 92
  39. 104
  40. 152

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