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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 665 · 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. 1.45 × 4 =
  2. 2.13 × 8 =
  3. 3.23 × 4 =
  4. 4.15 × 8 =
  5. 5.15 × 4 =
  6. 6.41 × 4 =
  7. 7.14 × 8 =
  8. 8.37 × 4 =
  9. 9.26 × 8 =
  10. 10.54 × 4 =
  11. 11.38 × 8 =
  12. 12.35 × 8 =
  13. 13.74 × 4 =
  14. 14.14 × 4 =
  15. 15.19 × 4 =
  16. 16.38 × 4 =
  17. 17.50 × 4 =
  18. 18.30 × 8 =
  19. 19.71 × 4 =
  20. 20.20 × 8 =
  21. 21.25 × 8 =
  22. 22.12 × 8 =
  23. 23.16 × 4 =
  24. 24.22 × 8 =
  25. 25.36 × 8 =
  26. 26.47 × 4 =
  27. 27.40 × 8 =
  28. 28.29 × 8 =
  29. 29.29 × 4 =
  30. 30.59 × 4 =
  31. 31.46 × 4 =
  32. 32.39 × 8 =
  33. 33.22 × 4 =
  34. 34.12 × 4 =
  35. 35.34 × 8 =
  36. 36.18 × 4 =
  37. 37.35 × 4 =
  38. 38.33 × 4 =
  39. 39.60 × 4 =
  40. 40.56 × 4 =

Answer key

  1. 180
  2. 104
  3. 92
  4. 120
  5. 60
  6. 164
  7. 112
  8. 148
  9. 208
  10. 216
  11. 304
  12. 280
  13. 296
  14. 56
  15. 76
  16. 152
  17. 200
  18. 240
  19. 284
  20. 160
  21. 200
  22. 96
  23. 64
  24. 176
  25. 288
  26. 188
  27. 320
  28. 232
  29. 116
  30. 236
  31. 184
  32. 312
  33. 88
  34. 48
  35. 272
  36. 72
  37. 140
  38. 132
  39. 240
  40. 224

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