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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 163 · 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. 1.25 × 4 =
  2. 2.16 × 8 =
  3. 3.37 × 4 =
  4. 4.48 × 4 =
  5. 5.75 × 4 =
  6. 6.30 × 8 =
  7. 7.23 × 8 =
  8. 8.35 × 4 =
  9. 9.30 × 4 =
  10. 10.13 × 8 =
  11. 11.36 × 8 =
  12. 12.32 × 4 =
  13. 13.18 × 8 =
  14. 14.55 × 4 =
  15. 15.25 × 8 =
  16. 16.26 × 8 =
  17. 17.74 × 4 =
  18. 18.39 × 8 =
  19. 19.41 × 4 =
  20. 20.31 × 8 =
  21. 21.27 × 8 =
  22. 22.54 × 4 =
  23. 23.21 × 8 =
  24. 24.26 × 4 =
  25. 25.65 × 4 =
  26. 26.43 × 4 =
  27. 27.16 × 4 =
  28. 28.15 × 8 =
  29. 29.24 × 8 =
  30. 30.44 × 4 =
  31. 31.20 × 8 =
  32. 32.33 × 4 =
  33. 33.66 × 4 =
  34. 34.69 × 4 =
  35. 35.14 × 8 =
  36. 36.22 × 8 =
  37. 37.33 × 8 =
  38. 38.49 × 4 =
  39. 39.38 × 8 =
  40. 40.12 × 8 =

Answer key

  1. 100
  2. 128
  3. 148
  4. 192
  5. 300
  6. 240
  7. 184
  8. 140
  9. 120
  10. 104
  11. 288
  12. 128
  13. 144
  14. 220
  15. 200
  16. 208
  17. 296
  18. 312
  19. 164
  20. 248
  21. 216
  22. 216
  23. 168
  24. 104
  25. 260
  26. 172
  27. 64
  28. 120
  29. 192
  30. 176
  31. 160
  32. 132
  33. 264
  34. 276
  35. 112
  36. 176
  37. 264
  38. 196
  39. 304
  40. 96

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