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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 24 · 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. 1.30 × 8 =
  2. 2.31 × 8 =
  3. 3.14 × 8 =
  4. 4.16 × 8 =
  5. 5.13 × 4 =
  6. 6.31 × 4 =
  7. 7.34 × 4 =
  8. 8.37 × 4 =
  9. 9.15 × 4 =
  10. 10.56 × 4 =
  11. 11.23 × 8 =
  12. 12.18 × 8 =
  13. 13.30 × 4 =
  14. 14.63 × 4 =
  15. 15.18 × 4 =
  16. 16.35 × 8 =
  17. 17.19 × 8 =
  18. 18.64 × 4 =
  19. 19.26 × 4 =
  20. 20.53 × 4 =
  21. 21.34 × 8 =
  22. 22.39 × 4 =
  23. 23.71 × 4 =
  24. 24.24 × 8 =
  25. 25.74 × 4 =
  26. 26.68 × 4 =
  27. 27.39 × 8 =
  28. 28.16 × 4 =
  29. 29.48 × 4 =
  30. 30.12 × 4 =
  31. 31.69 × 4 =
  32. 32.29 × 8 =
  33. 33.51 × 4 =
  34. 34.32 × 4 =
  35. 35.43 × 4 =
  36. 36.75 × 4 =
  37. 37.21 × 8 =
  38. 38.67 × 4 =
  39. 39.22 × 4 =
  40. 40.41 × 4 =

Answer key

  1. 240
  2. 248
  3. 112
  4. 128
  5. 52
  6. 124
  7. 136
  8. 148
  9. 60
  10. 224
  11. 184
  12. 144
  13. 120
  14. 252
  15. 72
  16. 280
  17. 152
  18. 256
  19. 104
  20. 212
  21. 272
  22. 156
  23. 284
  24. 192
  25. 296
  26. 272
  27. 312
  28. 64
  29. 192
  30. 48
  31. 276
  32. 232
  33. 204
  34. 128
  35. 172
  36. 300
  37. 168
  38. 268
  39. 88
  40. 164

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