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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 749 · 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. 1.16 × 4 =
  2. 2.16 × 8 =
  3. 3.25 × 4 =
  4. 4.20 × 8 =
  5. 5.59 × 4 =
  6. 6.57 × 4 =
  7. 7.31 × 8 =
  8. 8.41 × 4 =
  9. 9.67 × 4 =
  10. 10.32 × 4 =
  11. 11.32 × 8 =
  12. 12.39 × 4 =
  13. 13.25 × 8 =
  14. 14.66 × 4 =
  15. 15.18 × 8 =
  16. 16.24 × 8 =
  17. 17.29 × 4 =
  18. 18.20 × 4 =
  19. 19.30 × 8 =
  20. 20.13 × 8 =
  21. 21.37 × 8 =
  22. 22.54 × 4 =
  23. 23.12 × 4 =
  24. 24.73 × 4 =
  25. 25.29 × 8 =
  26. 26.12 × 8 =
  27. 27.39 × 8 =
  28. 28.19 × 8 =
  29. 29.36 × 8 =
  30. 30.35 × 4 =
  31. 31.30 × 4 =
  32. 32.38 × 8 =
  33. 33.22 × 4 =
  34. 34.55 × 4 =
  35. 35.52 × 4 =
  36. 36.75 × 4 =
  37. 37.26 × 8 =
  38. 38.58 × 4 =
  39. 39.14 × 8 =
  40. 40.15 × 4 =

Answer key

  1. 64
  2. 128
  3. 100
  4. 160
  5. 236
  6. 228
  7. 248
  8. 164
  9. 268
  10. 128
  11. 256
  12. 156
  13. 200
  14. 264
  15. 144
  16. 192
  17. 116
  18. 80
  19. 240
  20. 104
  21. 296
  22. 216
  23. 48
  24. 292
  25. 232
  26. 96
  27. 312
  28. 152
  29. 288
  30. 140
  31. 120
  32. 304
  33. 88
  34. 220
  35. 208
  36. 300
  37. 208
  38. 232
  39. 112
  40. 60

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