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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 99 · 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. 1.28 × 4 =
  2. 2.13 × 8 =
  3. 3.32 × 8 =
  4. 4.50 × 4 =
  5. 5.39 × 8 =
  6. 6.26 × 4 =
  7. 7.38 × 4 =
  8. 8.29 × 8 =
  9. 9.72 × 4 =
  10. 10.19 × 4 =
  11. 11.74 × 4 =
  12. 12.35 × 8 =
  13. 13.25 × 4 =
  14. 14.14 × 8 =
  15. 15.31 × 8 =
  16. 16.64 × 4 =
  17. 17.16 × 8 =
  18. 18.34 × 4 =
  19. 19.23 × 8 =
  20. 20.56 × 4 =
  21. 21.43 × 4 =
  22. 22.41 × 4 =
  23. 23.63 × 4 =
  24. 24.25 × 8 =
  25. 25.28 × 8 =
  26. 26.37 × 8 =
  27. 27.65 × 4 =
  28. 28.13 × 4 =
  29. 29.38 × 8 =
  30. 30.44 × 4 =
  31. 31.23 × 4 =
  32. 32.31 × 4 =
  33. 33.27 × 8 =
  34. 34.15 × 4 =
  35. 35.14 × 4 =
  36. 36.70 × 4 =
  37. 37.26 × 8 =
  38. 38.53 × 4 =
  39. 39.22 × 4 =
  40. 40.42 × 4 =

Answer key

  1. 112
  2. 104
  3. 256
  4. 200
  5. 312
  6. 104
  7. 152
  8. 232
  9. 288
  10. 76
  11. 296
  12. 280
  13. 100
  14. 112
  15. 248
  16. 256
  17. 128
  18. 136
  19. 184
  20. 224
  21. 172
  22. 164
  23. 252
  24. 200
  25. 224
  26. 296
  27. 260
  28. 52
  29. 304
  30. 176
  31. 92
  32. 124
  33. 216
  34. 60
  35. 56
  36. 280
  37. 208
  38. 212
  39. 88
  40. 168

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