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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 646 · 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. 1.27 × 8 =
  2. 2.20 × 8 =
  3. 3.66 × 4 =
  4. 4.13 × 8 =
  5. 5.12 × 4 =
  6. 6.12 × 8 =
  7. 7.48 × 4 =
  8. 8.16 × 4 =
  9. 9.41 × 4 =
  10. 10.58 × 4 =
  11. 11.39 × 4 =
  12. 12.38 × 8 =
  13. 13.14 × 8 =
  14. 14.36 × 4 =
  15. 15.72 × 4 =
  16. 16.28 × 4 =
  17. 17.33 × 4 =
  18. 18.73 × 4 =
  19. 19.45 × 4 =
  20. 20.16 × 8 =
  21. 21.70 × 4 =
  22. 22.61 × 4 =
  23. 23.34 × 4 =
  24. 24.23 × 4 =
  25. 25.39 × 8 =
  26. 26.64 × 4 =
  27. 27.31 × 4 =
  28. 28.28 × 8 =
  29. 29.25 × 8 =
  30. 30.15 × 8 =
  31. 31.17 × 8 =
  32. 32.52 × 4 =
  33. 33.25 × 4 =
  34. 34.31 × 8 =
  35. 35.56 × 4 =
  36. 36.51 × 4 =
  37. 37.68 × 4 =
  38. 38.24 × 4 =
  39. 39.71 × 4 =
  40. 40.40 × 8 =

Answer key

  1. 216
  2. 160
  3. 264
  4. 104
  5. 48
  6. 96
  7. 192
  8. 64
  9. 164
  10. 232
  11. 156
  12. 304
  13. 112
  14. 144
  15. 288
  16. 112
  17. 132
  18. 292
  19. 180
  20. 128
  21. 280
  22. 244
  23. 136
  24. 92
  25. 312
  26. 256
  27. 124
  28. 224
  29. 200
  30. 120
  31. 136
  32. 208
  33. 100
  34. 248
  35. 224
  36. 204
  37. 272
  38. 96
  39. 284
  40. 320

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