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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 920 · 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. 2.46 × 4 =
  3. 3.64 × 4 =
  4. 4.40 × 8 =
  5. 5.17 × 4 =
  6. 6.31 × 4 =
  7. 7.71 × 4 =
  8. 8.35 × 8 =
  9. 9.40 × 4 =
  10. 10.15 × 8 =
  11. 11.27 × 4 =
  12. 12.47 × 4 =
  13. 13.58 × 4 =
  14. 14.14 × 8 =
  15. 15.19 × 8 =
  16. 16.24 × 4 =
  17. 17.27 × 8 =
  18. 18.56 × 4 =
  19. 19.18 × 4 =
  20. 20.25 × 8 =
  21. 21.61 × 4 =
  22. 22.32 × 4 =
  23. 23.19 × 4 =
  24. 24.22 × 8 =
  25. 25.14 × 4 =
  26. 26.28 × 8 =
  27. 27.39 × 8 =
  28. 28.35 × 4 =
  29. 29.65 × 4 =
  30. 30.33 × 8 =
  31. 31.16 × 8 =
  32. 32.72 × 4 =
  33. 33.45 × 4 =
  34. 34.23 × 4 =
  35. 35.17 × 8 =
  36. 36.29 × 8 =
  37. 37.18 × 8 =
  38. 38.37 × 4 =
  39. 39.29 × 4 =
  40. 40.74 × 4 =

Answer key

  1. 304
  2. 184
  3. 256
  4. 320
  5. 68
  6. 124
  7. 284
  8. 280
  9. 160
  10. 120
  11. 108
  12. 188
  13. 232
  14. 112
  15. 152
  16. 96
  17. 216
  18. 224
  19. 72
  20. 200
  21. 244
  22. 128
  23. 76
  24. 176
  25. 56
  26. 224
  27. 312
  28. 140
  29. 260
  30. 264
  31. 128
  32. 288
  33. 180
  34. 92
  35. 136
  36. 232
  37. 144
  38. 148
  39. 116
  40. 296

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