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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 624 · 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. 1.35 × 8 =
  2. 2.20 × 8 =
  3. 3.15 × 8 =
  4. 4.36 × 8 =
  5. 5.56 × 4 =
  6. 6.50 × 4 =
  7. 7.54 × 4 =
  8. 8.22 × 8 =
  9. 9.34 × 8 =
  10. 10.69 × 4 =
  11. 11.72 × 4 =
  12. 12.16 × 8 =
  13. 13.34 × 4 =
  14. 14.40 × 4 =
  15. 15.47 × 4 =
  16. 16.15 × 4 =
  17. 17.71 × 4 =
  18. 18.19 × 4 =
  19. 19.52 × 4 =
  20. 20.35 × 4 =
  21. 21.23 × 4 =
  22. 22.58 × 4 =
  23. 23.68 × 4 =
  24. 24.66 × 4 =
  25. 25.62 × 4 =
  26. 26.39 × 4 =
  27. 27.19 × 8 =
  28. 28.24 × 4 =
  29. 29.33 × 4 =
  30. 30.26 × 8 =
  31. 31.40 × 8 =
  32. 32.75 × 4 =
  33. 33.42 × 4 =
  34. 34.55 × 4 =
  35. 35.20 × 4 =
  36. 36.12 × 8 =
  37. 37.48 × 4 =
  38. 38.22 × 4 =
  39. 39.33 × 8 =
  40. 40.25 × 4 =

Answer key

  1. 280
  2. 160
  3. 120
  4. 288
  5. 224
  6. 200
  7. 216
  8. 176
  9. 272
  10. 276
  11. 288
  12. 128
  13. 136
  14. 160
  15. 188
  16. 60
  17. 284
  18. 76
  19. 208
  20. 140
  21. 92
  22. 232
  23. 272
  24. 264
  25. 248
  26. 156
  27. 152
  28. 96
  29. 132
  30. 208
  31. 320
  32. 300
  33. 168
  34. 220
  35. 80
  36. 96
  37. 192
  38. 88
  39. 264
  40. 100

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