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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 611 · 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. 1.38 × 4 =
  2. 2.15 × 8 =
  3. 3.26 × 4 =
  4. 4.35 × 4 =
  5. 5.69 × 4 =
  6. 6.75 × 4 =
  7. 7.31 × 8 =
  8. 8.14 × 4 =
  9. 9.16 × 8 =
  10. 10.47 × 4 =
  11. 11.33 × 4 =
  12. 12.13 × 4 =
  13. 13.39 × 8 =
  14. 14.17 × 4 =
  15. 15.58 × 4 =
  16. 16.20 × 8 =
  17. 17.28 × 8 =
  18. 18.36 × 8 =
  19. 19.43 × 4 =
  20. 20.22 × 8 =
  21. 21.25 × 8 =
  22. 22.17 × 8 =
  23. 23.35 × 8 =
  24. 24.42 × 4 =
  25. 25.19 × 8 =
  26. 26.36 × 4 =
  27. 27.59 × 4 =
  28. 28.27 × 4 =
  29. 29.56 × 4 =
  30. 30.37 × 8 =
  31. 31.49 × 4 =
  32. 32.40 × 8 =
  33. 33.30 × 8 =
  34. 34.31 × 4 =
  35. 35.23 × 4 =
  36. 36.64 × 4 =
  37. 37.55 × 4 =
  38. 38.18 × 8 =
  39. 39.21 × 4 =
  40. 40.22 × 4 =

Answer key

  1. 152
  2. 120
  3. 104
  4. 140
  5. 276
  6. 300
  7. 248
  8. 56
  9. 128
  10. 188
  11. 132
  12. 52
  13. 312
  14. 68
  15. 232
  16. 160
  17. 224
  18. 288
  19. 172
  20. 176
  21. 200
  22. 136
  23. 280
  24. 168
  25. 152
  26. 144
  27. 236
  28. 108
  29. 224
  30. 296
  31. 196
  32. 320
  33. 240
  34. 124
  35. 92
  36. 256
  37. 220
  38. 144
  39. 84
  40. 88

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