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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 899 · 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. 1.25 × 4 =
  2. 2.36 × 8 =
  3. 3.49 × 4 =
  4. 4.31 × 4 =
  5. 5.38 × 8 =
  6. 6.39 × 4 =
  7. 7.35 × 8 =
  8. 8.70 × 4 =
  9. 9.29 × 8 =
  10. 10.19 × 8 =
  11. 11.58 × 4 =
  12. 12.15 × 4 =
  13. 13.30 × 8 =
  14. 14.74 × 4 =
  15. 15.20 × 4 =
  16. 16.34 × 4 =
  17. 17.33 × 4 =
  18. 18.45 × 4 =
  19. 19.24 × 4 =
  20. 20.41 × 4 =
  21. 21.32 × 4 =
  22. 22.37 × 4 =
  23. 23.20 × 8 =
  24. 24.68 × 4 =
  25. 25.23 × 8 =
  26. 26.22 × 8 =
  27. 27.75 × 4 =
  28. 28.56 × 4 =
  29. 29.24 × 8 =
  30. 30.12 × 4 =
  31. 31.53 × 4 =
  32. 32.27 × 8 =
  33. 33.28 × 8 =
  34. 34.64 × 4 =
  35. 35.14 × 4 =
  36. 36.18 × 8 =
  37. 37.61 × 4 =
  38. 38.62 × 4 =
  39. 39.32 × 8 =
  40. 40.21 × 4 =

Answer key

  1. 100
  2. 288
  3. 196
  4. 124
  5. 304
  6. 156
  7. 280
  8. 280
  9. 232
  10. 152
  11. 232
  12. 60
  13. 240
  14. 296
  15. 80
  16. 136
  17. 132
  18. 180
  19. 96
  20. 164
  21. 128
  22. 148
  23. 160
  24. 272
  25. 184
  26. 176
  27. 300
  28. 224
  29. 192
  30. 48
  31. 212
  32. 216
  33. 224
  34. 256
  35. 56
  36. 144
  37. 244
  38. 248
  39. 256
  40. 84

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