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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 113 · 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. 1.40 × 8 =
  2. 2.38 × 4 =
  3. 3.60 × 4 =
  4. 4.70 × 4 =
  5. 5.33 × 8 =
  6. 6.13 × 8 =
  7. 7.24 × 8 =
  8. 8.30 × 4 =
  9. 9.56 × 4 =
  10. 10.30 × 8 =
  11. 11.17 × 8 =
  12. 12.36 × 8 =
  13. 13.35 × 8 =
  14. 14.55 × 4 =
  15. 15.23 × 8 =
  16. 16.75 × 4 =
  17. 17.25 × 4 =
  18. 18.41 × 4 =
  19. 19.65 × 4 =
  20. 20.34 × 8 =
  21. 21.13 × 4 =
  22. 22.16 × 4 =
  23. 23.31 × 8 =
  24. 24.26 × 8 =
  25. 25.28 × 8 =
  26. 26.20 × 4 =
  27. 27.26 × 4 =
  28. 28.62 × 4 =
  29. 29.71 × 4 =
  30. 30.37 × 8 =
  31. 31.29 × 4 =
  32. 32.51 × 4 =
  33. 33.18 × 8 =
  34. 34.18 × 4 =
  35. 35.27 × 8 =
  36. 36.67 × 4 =
  37. 37.72 × 4 =
  38. 38.16 × 8 =
  39. 39.15 × 8 =
  40. 40.25 × 8 =

Answer key

  1. 320
  2. 152
  3. 240
  4. 280
  5. 264
  6. 104
  7. 192
  8. 120
  9. 224
  10. 240
  11. 136
  12. 288
  13. 280
  14. 220
  15. 184
  16. 300
  17. 100
  18. 164
  19. 260
  20. 272
  21. 52
  22. 64
  23. 248
  24. 208
  25. 224
  26. 80
  27. 104
  28. 248
  29. 284
  30. 296
  31. 116
  32. 204
  33. 144
  34. 72
  35. 216
  36. 268
  37. 288
  38. 128
  39. 120
  40. 200

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