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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 990 · 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. 1.19 × 4 =
  2. 2.16 × 8 =
  3. 3.27 × 8 =
  4. 4.29 × 8 =
  5. 5.42 × 4 =
  6. 6.17 × 4 =
  7. 7.33 × 4 =
  8. 8.30 × 8 =
  9. 9.61 × 4 =
  10. 10.35 × 4 =
  11. 11.54 × 4 =
  12. 12.34 × 4 =
  13. 13.12 × 8 =
  14. 14.60 × 4 =
  15. 15.23 × 8 =
  16. 16.36 × 4 =
  17. 17.40 × 4 =
  18. 18.64 × 4 =
  19. 19.53 × 4 =
  20. 20.13 × 8 =
  21. 21.51 × 4 =
  22. 22.24 × 8 =
  23. 23.24 × 4 =
  24. 24.63 × 4 =
  25. 25.15 × 8 =
  26. 26.21 × 4 =
  27. 27.25 × 4 =
  28. 28.16 × 4 =
  29. 29.23 × 4 =
  30. 30.75 × 4 =
  31. 31.40 × 8 =
  32. 32.14 × 4 =
  33. 33.28 × 4 =
  34. 34.28 × 8 =
  35. 35.20 × 8 =
  36. 36.41 × 4 =
  37. 37.26 × 8 =
  38. 38.31 × 8 =
  39. 39.52 × 4 =
  40. 40.68 × 4 =

Answer key

  1. 76
  2. 128
  3. 216
  4. 232
  5. 168
  6. 68
  7. 132
  8. 240
  9. 244
  10. 140
  11. 216
  12. 136
  13. 96
  14. 240
  15. 184
  16. 144
  17. 160
  18. 256
  19. 212
  20. 104
  21. 204
  22. 192
  23. 96
  24. 252
  25. 120
  26. 84
  27. 100
  28. 64
  29. 92
  30. 300
  31. 320
  32. 56
  33. 112
  34. 224
  35. 160
  36. 164
  37. 208
  38. 248
  39. 208
  40. 272

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