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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 629 · 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 × 8 =
  2. 2.32 × 4 =
  3. 3.17 × 8 =
  4. 4.15 × 8 =
  5. 5.52 × 4 =
  6. 6.21 × 4 =
  7. 7.25 × 8 =
  8. 8.68 × 4 =
  9. 9.20 × 8 =
  10. 10.44 × 4 =
  11. 11.39 × 8 =
  12. 12.33 × 4 =
  13. 13.22 × 8 =
  14. 14.75 × 4 =
  15. 15.40 × 4 =
  16. 16.15 × 4 =
  17. 17.23 × 4 =
  18. 18.19 × 4 =
  19. 19.23 × 8 =
  20. 20.29 × 4 =
  21. 21.53 × 4 =
  22. 22.40 × 8 =
  23. 23.26 × 4 =
  24. 24.14 × 8 =
  25. 25.55 × 4 =
  26. 26.35 × 8 =
  27. 27.47 × 4 =
  28. 28.34 × 4 =
  29. 29.26 × 8 =
  30. 30.16 × 8 =
  31. 31.51 × 4 =
  32. 32.20 × 4 =
  33. 33.28 × 8 =
  34. 34.21 × 8 =
  35. 35.64 × 4 =
  36. 36.63 × 4 =
  37. 37.33 × 8 =
  38. 38.28 × 4 =
  39. 39.18 × 4 =
  40. 40.31 × 8 =

Answer key

  1. 152
  2. 128
  3. 136
  4. 120
  5. 208
  6. 84
  7. 200
  8. 272
  9. 160
  10. 176
  11. 312
  12. 132
  13. 176
  14. 300
  15. 160
  16. 60
  17. 92
  18. 76
  19. 184
  20. 116
  21. 212
  22. 320
  23. 104
  24. 112
  25. 220
  26. 280
  27. 188
  28. 136
  29. 208
  30. 128
  31. 204
  32. 80
  33. 224
  34. 168
  35. 256
  36. 252
  37. 264
  38. 112
  39. 72
  40. 248

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