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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 921 · 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. 1.63 × 4 =
  2. 2.56 × 4 =
  3. 3.15 × 4 =
  4. 4.31 × 8 =
  5. 5.24 × 8 =
  6. 6.53 × 4 =
  7. 7.19 × 8 =
  8. 8.12 × 8 =
  9. 9.39 × 8 =
  10. 10.30 × 8 =
  11. 11.17 × 4 =
  12. 12.27 × 8 =
  13. 13.34 × 8 =
  14. 14.72 × 4 =
  15. 15.51 × 4 =
  16. 16.38 × 8 =
  17. 17.37 × 4 =
  18. 18.40 × 8 =
  19. 19.28 × 4 =
  20. 20.32 × 8 =
  21. 21.20 × 8 =
  22. 22.14 × 8 =
  23. 23.16 × 8 =
  24. 24.15 × 8 =
  25. 25.37 × 8 =
  26. 26.36 × 8 =
  27. 27.62 × 4 =
  28. 28.20 × 4 =
  29. 29.57 × 4 =
  30. 30.68 × 4 =
  31. 31.26 × 4 =
  32. 32.25 × 4 =
  33. 33.65 × 4 =
  34. 34.35 × 8 =
  35. 35.12 × 4 =
  36. 36.28 × 8 =
  37. 37.25 × 8 =
  38. 38.33 × 4 =
  39. 39.18 × 8 =
  40. 40.66 × 4 =

Answer key

  1. 252
  2. 224
  3. 60
  4. 248
  5. 192
  6. 212
  7. 152
  8. 96
  9. 312
  10. 240
  11. 68
  12. 216
  13. 272
  14. 288
  15. 204
  16. 304
  17. 148
  18. 320
  19. 112
  20. 256
  21. 160
  22. 112
  23. 128
  24. 120
  25. 296
  26. 288
  27. 248
  28. 80
  29. 228
  30. 272
  31. 104
  32. 100
  33. 260
  34. 280
  35. 48
  36. 224
  37. 200
  38. 132
  39. 144
  40. 264

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