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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 681 · 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. 1.70 × 4 =
  2. 2.18 × 4 =
  3. 3.56 × 4 =
  4. 4.15 × 4 =
  5. 5.32 × 8 =
  6. 6.12 × 4 =
  7. 7.39 × 8 =
  8. 8.45 × 4 =
  9. 9.60 × 4 =
  10. 10.50 × 4 =
  11. 11.59 × 4 =
  12. 12.54 × 4 =
  13. 13.18 × 8 =
  14. 14.16 × 8 =
  15. 15.61 × 4 =
  16. 16.64 × 4 =
  17. 17.39 × 4 =
  18. 18.33 × 8 =
  19. 19.19 × 8 =
  20. 20.65 × 4 =
  21. 21.26 × 8 =
  22. 22.30 × 4 =
  23. 23.27 × 4 =
  24. 24.33 × 4 =
  25. 25.20 × 4 =
  26. 26.32 × 4 =
  27. 27.12 × 8 =
  28. 28.73 × 4 =
  29. 29.71 × 4 =
  30. 30.13 × 8 =
  31. 31.15 × 8 =
  32. 32.27 × 8 =
  33. 33.69 × 4 =
  34. 34.37 × 4 =
  35. 35.40 × 8 =
  36. 36.28 × 8 =
  37. 37.55 × 4 =
  38. 38.34 × 4 =
  39. 39.62 × 4 =
  40. 40.47 × 4 =

Answer key

  1. 280
  2. 72
  3. 224
  4. 60
  5. 256
  6. 48
  7. 312
  8. 180
  9. 240
  10. 200
  11. 236
  12. 216
  13. 144
  14. 128
  15. 244
  16. 256
  17. 156
  18. 264
  19. 152
  20. 260
  21. 208
  22. 120
  23. 108
  24. 132
  25. 80
  26. 128
  27. 96
  28. 292
  29. 284
  30. 104
  31. 120
  32. 216
  33. 276
  34. 148
  35. 320
  36. 224
  37. 220
  38. 136
  39. 248
  40. 188

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