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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 509 · 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. 1.13 × 4 =
  2. 2.41 × 4 =
  3. 3.14 × 4 =
  4. 4.69 × 4 =
  5. 5.66 × 4 =
  6. 6.70 × 4 =
  7. 7.60 × 4 =
  8. 8.31 × 8 =
  9. 9.62 × 4 =
  10. 10.24 × 8 =
  11. 11.17 × 8 =
  12. 12.40 × 8 =
  13. 13.13 × 8 =
  14. 14.36 × 8 =
  15. 15.38 × 8 =
  16. 16.39 × 4 =
  17. 17.50 × 4 =
  18. 18.67 × 4 =
  19. 19.12 × 8 =
  20. 20.44 × 4 =
  21. 21.25 × 8 =
  22. 22.37 × 8 =
  23. 23.29 × 8 =
  24. 24.23 × 4 =
  25. 25.45 × 4 =
  26. 26.26 × 8 =
  27. 27.51 × 4 =
  28. 28.21 × 4 =
  29. 29.34 × 4 =
  30. 30.40 × 4 =
  31. 31.53 × 4 =
  32. 32.42 × 4 =
  33. 33.18 × 4 =
  34. 34.29 × 4 =
  35. 35.56 × 4 =
  36. 36.39 × 8 =
  37. 37.36 × 4 =
  38. 38.52 × 4 =
  39. 39.12 × 4 =
  40. 40.30 × 4 =

Answer key

  1. 52
  2. 164
  3. 56
  4. 276
  5. 264
  6. 280
  7. 240
  8. 248
  9. 248
  10. 192
  11. 136
  12. 320
  13. 104
  14. 288
  15. 304
  16. 156
  17. 200
  18. 268
  19. 96
  20. 176
  21. 200
  22. 296
  23. 232
  24. 92
  25. 180
  26. 208
  27. 204
  28. 84
  29. 136
  30. 160
  31. 212
  32. 168
  33. 72
  34. 116
  35. 224
  36. 312
  37. 144
  38. 208
  39. 48
  40. 120

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