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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 939 · 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. 1.38 × 8 =
  2. 2.14 × 4 =
  3. 3.35 × 8 =
  4. 4.18 × 4 =
  5. 5.40 × 4 =
  6. 6.21 × 8 =
  7. 7.68 × 4 =
  8. 8.20 × 8 =
  9. 9.27 × 4 =
  10. 10.13 × 8 =
  11. 11.60 × 4 =
  12. 12.15 × 8 =
  13. 13.61 × 4 =
  14. 14.20 × 4 =
  15. 15.17 × 8 =
  16. 16.43 × 4 =
  17. 17.25 × 4 =
  18. 18.70 × 4 =
  19. 19.55 × 4 =
  20. 20.71 × 4 =
  21. 21.62 × 4 =
  22. 22.16 × 8 =
  23. 23.19 × 4 =
  24. 24.37 × 4 =
  25. 25.30 × 8 =
  26. 26.42 × 4 =
  27. 27.50 × 4 =
  28. 28.73 × 4 =
  29. 29.13 × 4 =
  30. 30.37 × 8 =
  31. 31.38 × 4 =
  32. 32.22 × 4 =
  33. 33.12 × 8 =
  34. 34.24 × 8 =
  35. 35.36 × 4 =
  36. 36.63 × 4 =
  37. 37.17 × 4 =
  38. 38.30 × 4 =
  39. 39.35 × 4 =
  40. 40.33 × 8 =

Answer key

  1. 304
  2. 56
  3. 280
  4. 72
  5. 160
  6. 168
  7. 272
  8. 160
  9. 108
  10. 104
  11. 240
  12. 120
  13. 244
  14. 80
  15. 136
  16. 172
  17. 100
  18. 280
  19. 220
  20. 284
  21. 248
  22. 128
  23. 76
  24. 148
  25. 240
  26. 168
  27. 200
  28. 292
  29. 52
  30. 296
  31. 152
  32. 88
  33. 96
  34. 192
  35. 144
  36. 252
  37. 68
  38. 120
  39. 140
  40. 264

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