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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 472 · 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. 1.24 × 8 =
  2. 2.20 × 8 =
  3. 3.13 × 8 =
  4. 4.51 × 4 =
  5. 5.22 × 8 =
  6. 6.32 × 8 =
  7. 7.50 × 4 =
  8. 8.14 × 4 =
  9. 9.36 × 8 =
  10. 10.40 × 4 =
  11. 11.39 × 8 =
  12. 12.12 × 4 =
  13. 13.17 × 4 =
  14. 14.30 × 4 =
  15. 15.25 × 8 =
  16. 16.65 × 4 =
  17. 17.15 × 8 =
  18. 18.72 × 4 =
  19. 19.46 × 4 =
  20. 20.30 × 8 =
  21. 21.26 × 4 =
  22. 22.32 × 4 =
  23. 23.12 × 8 =
  24. 24.18 × 8 =
  25. 25.47 × 4 =
  26. 26.37 × 4 =
  27. 27.17 × 8 =
  28. 28.69 × 4 =
  29. 29.16 × 8 =
  30. 30.75 × 4 =
  31. 31.35 × 8 =
  32. 32.34 × 8 =
  33. 33.18 × 4 =
  34. 34.16 × 4 =
  35. 35.70 × 4 =
  36. 36.31 × 8 =
  37. 37.31 × 4 =
  38. 38.23 × 8 =
  39. 39.38 × 4 =
  40. 40.28 × 8 =

Answer key

  1. 192
  2. 160
  3. 104
  4. 204
  5. 176
  6. 256
  7. 200
  8. 56
  9. 288
  10. 160
  11. 312
  12. 48
  13. 68
  14. 120
  15. 200
  16. 260
  17. 120
  18. 288
  19. 184
  20. 240
  21. 104
  22. 128
  23. 96
  24. 144
  25. 188
  26. 148
  27. 136
  28. 276
  29. 128
  30. 300
  31. 280
  32. 272
  33. 72
  34. 64
  35. 280
  36. 248
  37. 124
  38. 184
  39. 152
  40. 224

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