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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 909 · 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. 1.64 × 4 =
  2. 2.38 × 4 =
  3. 3.33 × 8 =
  4. 4.22 × 8 =
  5. 5.13 × 8 =
  6. 6.59 × 4 =
  7. 7.70 × 4 =
  8. 8.37 × 8 =
  9. 9.36 × 8 =
  10. 10.45 × 4 =
  11. 11.32 × 8 =
  12. 12.65 × 4 =
  13. 13.21 × 8 =
  14. 14.24 × 8 =
  15. 15.14 × 8 =
  16. 16.19 × 8 =
  17. 17.61 × 4 =
  18. 18.15 × 8 =
  19. 19.25 × 8 =
  20. 20.26 × 4 =
  21. 21.15 × 4 =
  22. 22.40 × 8 =
  23. 23.13 × 4 =
  24. 24.43 × 4 =
  25. 25.44 × 4 =
  26. 26.36 × 4 =
  27. 27.12 × 8 =
  28. 28.31 × 8 =
  29. 29.18 × 8 =
  30. 30.34 × 8 =
  31. 31.16 × 8 =
  32. 32.39 × 8 =
  33. 33.22 × 4 =
  34. 34.72 × 4 =
  35. 35.60 × 4 =
  36. 36.42 × 4 =
  37. 37.17 × 8 =
  38. 38.35 × 8 =
  39. 39.27 × 8 =
  40. 40.25 × 4 =

Answer key

  1. 256
  2. 152
  3. 264
  4. 176
  5. 104
  6. 236
  7. 280
  8. 296
  9. 288
  10. 180
  11. 256
  12. 260
  13. 168
  14. 192
  15. 112
  16. 152
  17. 244
  18. 120
  19. 200
  20. 104
  21. 60
  22. 320
  23. 52
  24. 172
  25. 176
  26. 144
  27. 96
  28. 248
  29. 144
  30. 272
  31. 128
  32. 312
  33. 88
  34. 288
  35. 240
  36. 168
  37. 136
  38. 280
  39. 216
  40. 100

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