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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 321 · 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. 1.40 × 4 =
  2. 2.13 × 4 =
  3. 3.31 × 8 =
  4. 4.37 × 4 =
  5. 5.32 × 8 =
  6. 6.70 × 4 =
  7. 7.27 × 4 =
  8. 8.43 × 4 =
  9. 9.16 × 8 =
  10. 10.18 × 4 =
  11. 11.32 × 4 =
  12. 12.62 × 4 =
  13. 13.30 × 8 =
  14. 14.52 × 4 =
  15. 15.54 × 4 =
  16. 16.24 × 8 =
  17. 17.34 × 4 =
  18. 18.67 × 4 =
  19. 19.57 × 4 =
  20. 20.51 × 4 =
  21. 21.46 × 4 =
  22. 22.28 × 4 =
  23. 23.13 × 8 =
  24. 24.68 × 4 =
  25. 25.22 × 4 =
  26. 26.41 × 4 =
  27. 27.66 × 4 =
  28. 28.39 × 8 =
  29. 29.74 × 4 =
  30. 30.28 × 8 =
  31. 31.14 × 8 =
  32. 32.15 × 4 =
  33. 33.45 × 4 =
  34. 34.33 × 8 =
  35. 35.24 × 4 =
  36. 36.44 × 4 =
  37. 37.36 × 8 =
  38. 38.20 × 8 =
  39. 39.25 × 8 =
  40. 40.59 × 4 =

Answer key

  1. 160
  2. 52
  3. 248
  4. 148
  5. 256
  6. 280
  7. 108
  8. 172
  9. 128
  10. 72
  11. 128
  12. 248
  13. 240
  14. 208
  15. 216
  16. 192
  17. 136
  18. 268
  19. 228
  20. 204
  21. 184
  22. 112
  23. 104
  24. 272
  25. 88
  26. 164
  27. 264
  28. 312
  29. 296
  30. 224
  31. 112
  32. 60
  33. 180
  34. 264
  35. 96
  36. 176
  37. 288
  38. 160
  39. 200
  40. 236

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