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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 678 · 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. 1.45 × 4 =
  2. 2.47 × 4 =
  3. 3.41 × 4 =
  4. 4.31 × 8 =
  5. 5.35 × 8 =
  6. 6.34 × 4 =
  7. 7.40 × 8 =
  8. 8.15 × 4 =
  9. 9.36 × 8 =
  10. 10.22 × 4 =
  11. 11.37 × 4 =
  12. 12.19 × 4 =
  13. 13.17 × 8 =
  14. 14.19 × 8 =
  15. 15.21 × 8 =
  16. 16.42 × 4 =
  17. 17.33 × 8 =
  18. 18.26 × 8 =
  19. 19.75 × 4 =
  20. 20.12 × 8 =
  21. 21.49 × 4 =
  22. 22.28 × 8 =
  23. 23.39 × 8 =
  24. 24.53 × 4 =
  25. 25.63 × 4 =
  26. 26.65 × 4 =
  27. 27.54 × 4 =
  28. 28.16 × 4 =
  29. 29.29 × 4 =
  30. 30.14 × 4 =
  31. 31.30 × 8 =
  32. 32.15 × 8 =
  33. 33.51 × 4 =
  34. 34.69 × 4 =
  35. 35.22 × 8 =
  36. 36.30 × 4 =
  37. 37.25 × 4 =
  38. 38.29 × 8 =
  39. 39.18 × 8 =
  40. 40.24 × 8 =

Answer key

  1. 180
  2. 188
  3. 164
  4. 248
  5. 280
  6. 136
  7. 320
  8. 60
  9. 288
  10. 88
  11. 148
  12. 76
  13. 136
  14. 152
  15. 168
  16. 168
  17. 264
  18. 208
  19. 300
  20. 96
  21. 196
  22. 224
  23. 312
  24. 212
  25. 252
  26. 260
  27. 216
  28. 64
  29. 116
  30. 56
  31. 240
  32. 120
  33. 204
  34. 276
  35. 176
  36. 120
  37. 100
  38. 232
  39. 144
  40. 192

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