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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 751 · 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. 1.64 × 4 =
  2. 2.16 × 8 =
  3. 3.26 × 4 =
  4. 4.55 × 4 =
  5. 5.19 × 8 =
  6. 6.35 × 4 =
  7. 7.63 × 4 =
  8. 8.22 × 4 =
  9. 9.12 × 4 =
  10. 10.29 × 8 =
  11. 11.33 × 4 =
  12. 12.25 × 8 =
  13. 13.26 × 8 =
  14. 14.53 × 4 =
  15. 15.73 × 4 =
  16. 16.68 × 4 =
  17. 17.24 × 8 =
  18. 18.56 × 4 =
  19. 19.62 × 4 =
  20. 20.27 × 8 =
  21. 21.38 × 4 =
  22. 22.13 × 8 =
  23. 23.32 × 8 =
  24. 24.16 × 4 =
  25. 25.29 × 4 =
  26. 26.22 × 8 =
  27. 27.15 × 8 =
  28. 28.21 × 4 =
  29. 29.28 × 8 =
  30. 30.17 × 8 =
  31. 31.41 × 4 =
  32. 32.20 × 8 =
  33. 33.37 × 8 =
  34. 34.36 × 8 =
  35. 35.31 × 8 =
  36. 36.71 × 4 =
  37. 37.40 × 4 =
  38. 38.43 × 4 =
  39. 39.30 × 8 =
  40. 40.44 × 4 =

Answer key

  1. 256
  2. 128
  3. 104
  4. 220
  5. 152
  6. 140
  7. 252
  8. 88
  9. 48
  10. 232
  11. 132
  12. 200
  13. 208
  14. 212
  15. 292
  16. 272
  17. 192
  18. 224
  19. 248
  20. 216
  21. 152
  22. 104
  23. 256
  24. 64
  25. 116
  26. 176
  27. 120
  28. 84
  29. 224
  30. 136
  31. 164
  32. 160
  33. 296
  34. 288
  35. 248
  36. 284
  37. 160
  38. 172
  39. 240
  40. 176

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