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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 591 · 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. 1.23 × 4 =
  2. 2.40 × 8 =
  3. 3.18 × 8 =
  4. 4.19 × 8 =
  5. 5.55 × 4 =
  6. 6.17 × 4 =
  7. 7.37 × 4 =
  8. 8.38 × 8 =
  9. 9.26 × 4 =
  10. 10.70 × 4 =
  11. 11.51 × 4 =
  12. 12.44 × 4 =
  13. 13.12 × 8 =
  14. 14.25 × 4 =
  15. 15.20 × 8 =
  16. 16.29 × 8 =
  17. 17.49 × 4 =
  18. 18.61 × 4 =
  19. 19.13 × 8 =
  20. 20.23 × 8 =
  21. 21.31 × 8 =
  22. 22.75 × 4 =
  23. 23.22 × 8 =
  24. 24.47 × 4 =
  25. 25.25 × 8 =
  26. 26.16 × 4 =
  27. 27.26 × 8 =
  28. 28.73 × 4 =
  29. 29.48 × 4 =
  30. 30.65 × 4 =
  31. 31.34 × 8 =
  32. 32.69 × 4 =
  33. 33.40 × 4 =
  34. 34.50 × 4 =
  35. 35.33 × 8 =
  36. 36.59 × 4 =
  37. 37.60 × 4 =
  38. 38.39 × 8 =
  39. 39.37 × 8 =
  40. 40.15 × 4 =

Answer key

  1. 92
  2. 320
  3. 144
  4. 152
  5. 220
  6. 68
  7. 148
  8. 304
  9. 104
  10. 280
  11. 204
  12. 176
  13. 96
  14. 100
  15. 160
  16. 232
  17. 196
  18. 244
  19. 104
  20. 184
  21. 248
  22. 300
  23. 176
  24. 188
  25. 200
  26. 64
  27. 208
  28. 292
  29. 192
  30. 260
  31. 272
  32. 276
  33. 160
  34. 200
  35. 264
  36. 236
  37. 240
  38. 312
  39. 296
  40. 60

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