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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 650 · 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. 1.64 × 4 =
  2. 2.37 × 8 =
  3. 3.30 × 4 =
  4. 4.43 × 4 =
  5. 5.72 × 4 =
  6. 6.58 × 4 =
  7. 7.47 × 4 =
  8. 8.46 × 4 =
  9. 9.23 × 4 =
  10. 10.34 × 4 =
  11. 11.19 × 8 =
  12. 12.39 × 8 =
  13. 13.38 × 8 =
  14. 14.42 × 4 =
  15. 15.24 × 8 =
  16. 16.37 × 4 =
  17. 17.16 × 4 =
  18. 18.50 × 4 =
  19. 19.14 × 8 =
  20. 20.31 × 8 =
  21. 21.41 × 4 =
  22. 22.28 × 4 =
  23. 23.15 × 4 =
  24. 24.54 × 4 =
  25. 25.29 × 8 =
  26. 26.16 × 8 =
  27. 27.26 × 8 =
  28. 28.35 × 8 =
  29. 29.69 × 4 =
  30. 30.31 × 4 =
  31. 31.56 × 4 =
  32. 32.52 × 4 =
  33. 33.12 × 8 =
  34. 34.63 × 4 =
  35. 35.17 × 8 =
  36. 36.61 × 4 =
  37. 37.62 × 4 =
  38. 38.67 × 4 =
  39. 39.48 × 4 =
  40. 40.19 × 4 =

Answer key

  1. 256
  2. 296
  3. 120
  4. 172
  5. 288
  6. 232
  7. 188
  8. 184
  9. 92
  10. 136
  11. 152
  12. 312
  13. 304
  14. 168
  15. 192
  16. 148
  17. 64
  18. 200
  19. 112
  20. 248
  21. 164
  22. 112
  23. 60
  24. 216
  25. 232
  26. 128
  27. 208
  28. 280
  29. 276
  30. 124
  31. 224
  32. 208
  33. 96
  34. 252
  35. 136
  36. 244
  37. 248
  38. 268
  39. 192
  40. 76

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