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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 374 · 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. 1.47 × 4 =
  2. 2.55 × 4 =
  3. 3.12 × 8 =
  4. 4.29 × 4 =
  5. 5.36 × 4 =
  6. 6.33 × 8 =
  7. 7.39 × 4 =
  8. 8.33 × 4 =
  9. 9.24 × 4 =
  10. 10.67 × 4 =
  11. 11.65 × 4 =
  12. 12.20 × 8 =
  13. 13.61 × 4 =
  14. 14.13 × 8 =
  15. 15.75 × 4 =
  16. 16.60 × 4 =
  17. 17.40 × 8 =
  18. 18.38 × 8 =
  19. 19.66 × 4 =
  20. 20.51 × 4 =
  21. 21.41 × 4 =
  22. 22.20 × 4 =
  23. 23.23 × 8 =
  24. 24.17 × 4 =
  25. 25.32 × 8 =
  26. 26.62 × 4 =
  27. 27.12 × 4 =
  28. 28.24 × 8 =
  29. 29.28 × 8 =
  30. 30.30 × 8 =
  31. 31.52 × 4 =
  32. 32.64 × 4 =
  33. 33.27 × 8 =
  34. 34.45 × 4 =
  35. 35.18 × 8 =
  36. 36.17 × 8 =
  37. 37.42 × 4 =
  38. 38.28 × 4 =
  39. 39.16 × 8 =
  40. 40.25 × 4 =

Answer key

  1. 188
  2. 220
  3. 96
  4. 116
  5. 144
  6. 264
  7. 156
  8. 132
  9. 96
  10. 268
  11. 260
  12. 160
  13. 244
  14. 104
  15. 300
  16. 240
  17. 320
  18. 304
  19. 264
  20. 204
  21. 164
  22. 80
  23. 184
  24. 68
  25. 256
  26. 248
  27. 48
  28. 192
  29. 224
  30. 240
  31. 208
  32. 256
  33. 216
  34. 180
  35. 144
  36. 136
  37. 168
  38. 112
  39. 128
  40. 100

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