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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 449 · 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. 1.18 × 8 =
  2. 2.26 × 4 =
  3. 3.14 × 8 =
  4. 4.21 × 8 =
  5. 5.17 × 4 =
  6. 6.33 × 4 =
  7. 7.70 × 4 =
  8. 8.22 × 4 =
  9. 9.50 × 4 =
  10. 10.17 × 8 =
  11. 11.42 × 4 =
  12. 12.29 × 8 =
  13. 13.49 × 4 =
  14. 14.64 × 4 =
  15. 15.13 × 4 =
  16. 16.31 × 4 =
  17. 17.59 × 4 =
  18. 18.39 × 8 =
  19. 19.46 × 4 =
  20. 20.28 × 8 =
  21. 21.20 × 4 =
  22. 22.18 × 4 =
  23. 23.16 × 8 =
  24. 24.28 × 4 =
  25. 25.36 × 4 =
  26. 26.44 × 4 =
  27. 27.53 × 4 =
  28. 28.34 × 4 =
  29. 29.24 × 8 =
  30. 30.72 × 4 =
  31. 31.71 × 4 =
  32. 32.31 × 8 =
  33. 33.67 × 4 =
  34. 34.38 × 4 =
  35. 35.32 × 8 =
  36. 36.35 × 8 =
  37. 37.45 × 4 =
  38. 38.12 × 8 =
  39. 39.15 × 4 =
  40. 40.36 × 8 =

Answer key

  1. 144
  2. 104
  3. 112
  4. 168
  5. 68
  6. 132
  7. 280
  8. 88
  9. 200
  10. 136
  11. 168
  12. 232
  13. 196
  14. 256
  15. 52
  16. 124
  17. 236
  18. 312
  19. 184
  20. 224
  21. 80
  22. 72
  23. 128
  24. 112
  25. 144
  26. 176
  27. 212
  28. 136
  29. 192
  30. 288
  31. 284
  32. 248
  33. 268
  34. 152
  35. 256
  36. 280
  37. 180
  38. 96
  39. 60
  40. 288

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