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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 717 · 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. 2.17 × 4 =
  3. 3.14 × 8 =
  4. 4.29 × 8 =
  5. 5.31 × 4 =
  6. 6.17 × 8 =
  7. 7.25 × 4 =
  8. 8.13 × 8 =
  9. 9.21 × 8 =
  10. 10.73 × 4 =
  11. 11.43 × 4 =
  12. 12.20 × 4 =
  13. 13.33 × 4 =
  14. 14.55 × 4 =
  15. 15.63 × 4 =
  16. 16.18 × 4 =
  17. 17.58 × 4 =
  18. 18.19 × 8 =
  19. 19.40 × 8 =
  20. 20.30 × 8 =
  21. 21.23 × 8 =
  22. 22.37 × 4 =
  23. 23.28 × 4 =
  24. 24.38 × 4 =
  25. 25.35 × 4 =
  26. 26.21 × 4 =
  27. 27.31 × 8 =
  28. 28.32 × 8 =
  29. 29.26 × 8 =
  30. 30.20 × 8 =
  31. 31.57 × 4 =
  32. 32.28 × 8 =
  33. 33.35 × 8 =
  34. 34.18 × 8 =
  35. 35.38 × 8 =
  36. 36.15 × 8 =
  37. 37.67 × 4 =
  38. 38.27 × 8 =
  39. 39.16 × 8 =
  40. 40.62 × 4 =

Answer key

  1. 312
  2. 68
  3. 112
  4. 232
  5. 124
  6. 136
  7. 100
  8. 104
  9. 168
  10. 292
  11. 172
  12. 80
  13. 132
  14. 220
  15. 252
  16. 72
  17. 232
  18. 152
  19. 320
  20. 240
  21. 184
  22. 148
  23. 112
  24. 152
  25. 140
  26. 84
  27. 248
  28. 256
  29. 208
  30. 160
  31. 228
  32. 224
  33. 280
  34. 144
  35. 304
  36. 120
  37. 268
  38. 216
  39. 128
  40. 248

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