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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 642 · 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. 1.37 × 4 =
  2. 2.73 × 4 =
  3. 3.18 × 4 =
  4. 4.33 × 4 =
  5. 5.40 × 4 =
  6. 6.12 × 8 =
  7. 7.26 × 8 =
  8. 8.25 × 4 =
  9. 9.50 × 4 =
  10. 10.24 × 8 =
  11. 11.30 × 8 =
  12. 12.13 × 8 =
  13. 13.44 × 4 =
  14. 14.18 × 8 =
  15. 15.21 × 4 =
  16. 16.20 × 8 =
  17. 17.43 × 4 =
  18. 18.27 × 4 =
  19. 19.39 × 8 =
  20. 20.27 × 8 =
  21. 21.19 × 8 =
  22. 22.68 × 4 =
  23. 23.34 × 8 =
  24. 24.36 × 8 =
  25. 25.61 × 4 =
  26. 26.19 × 4 =
  27. 27.31 × 8 =
  28. 28.16 × 8 =
  29. 29.36 × 4 =
  30. 30.29 × 8 =
  31. 31.67 × 4 =
  32. 32.23 × 4 =
  33. 33.15 × 8 =
  34. 34.21 × 8 =
  35. 35.56 × 4 =
  36. 36.70 × 4 =
  37. 37.32 × 8 =
  38. 38.40 × 8 =
  39. 39.28 × 8 =
  40. 40.16 × 4 =

Answer key

  1. 148
  2. 292
  3. 72
  4. 132
  5. 160
  6. 96
  7. 208
  8. 100
  9. 200
  10. 192
  11. 240
  12. 104
  13. 176
  14. 144
  15. 84
  16. 160
  17. 172
  18. 108
  19. 312
  20. 216
  21. 152
  22. 272
  23. 272
  24. 288
  25. 244
  26. 76
  27. 248
  28. 128
  29. 144
  30. 232
  31. 268
  32. 92
  33. 120
  34. 168
  35. 224
  36. 280
  37. 256
  38. 320
  39. 224
  40. 64

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