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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 323 · 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. 1.23 × 8 =
  2. 2.21 × 8 =
  3. 3.41 × 4 =
  4. 4.56 × 4 =
  5. 5.39 × 4 =
  6. 6.53 × 4 =
  7. 7.31 × 8 =
  8. 8.36 × 8 =
  9. 9.71 × 4 =
  10. 10.73 × 4 =
  11. 11.32 × 4 =
  12. 12.20 × 8 =
  13. 13.32 × 8 =
  14. 14.40 × 4 =
  15. 15.21 × 4 =
  16. 16.35 × 8 =
  17. 17.14 × 8 =
  18. 18.43 × 4 =
  19. 19.15 × 8 =
  20. 20.24 × 4 =
  21. 21.29 × 8 =
  22. 22.34 × 8 =
  23. 23.31 × 4 =
  24. 24.42 × 4 =
  25. 25.35 × 4 =
  26. 26.33 × 4 =
  27. 27.25 × 4 =
  28. 28.61 × 4 =
  29. 29.23 × 4 =
  30. 30.51 × 4 =
  31. 31.19 × 8 =
  32. 32.25 × 8 =
  33. 33.38 × 8 =
  34. 34.74 × 4 =
  35. 35.55 × 4 =
  36. 36.12 × 8 =
  37. 37.13 × 8 =
  38. 38.68 × 4 =
  39. 39.24 × 8 =
  40. 40.30 × 8 =

Answer key

  1. 184
  2. 168
  3. 164
  4. 224
  5. 156
  6. 212
  7. 248
  8. 288
  9. 284
  10. 292
  11. 128
  12. 160
  13. 256
  14. 160
  15. 84
  16. 280
  17. 112
  18. 172
  19. 120
  20. 96
  21. 232
  22. 272
  23. 124
  24. 168
  25. 140
  26. 132
  27. 100
  28. 244
  29. 92
  30. 204
  31. 152
  32. 200
  33. 304
  34. 296
  35. 220
  36. 96
  37. 104
  38. 272
  39. 192
  40. 240

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