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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 201 · 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. 1.32 × 4 =
  2. 2.16 × 8 =
  3. 3.22 × 8 =
  4. 4.45 × 4 =
  5. 5.13 × 8 =
  6. 6.28 × 4 =
  7. 7.36 × 4 =
  8. 8.23 × 8 =
  9. 9.40 × 4 =
  10. 10.37 × 8 =
  11. 11.28 × 8 =
  12. 12.39 × 8 =
  13. 13.33 × 8 =
  14. 14.14 × 4 =
  15. 15.15 × 8 =
  16. 16.38 × 8 =
  17. 17.20 × 8 =
  18. 18.75 × 4 =
  19. 19.19 × 8 =
  20. 20.58 × 4 =
  21. 21.74 × 4 =
  22. 22.57 × 4 =
  23. 23.32 × 8 =
  24. 24.68 × 4 =
  25. 25.65 × 4 =
  26. 26.43 × 4 =
  27. 27.48 × 4 =
  28. 28.20 × 4 =
  29. 29.26 × 4 =
  30. 30.17 × 4 =
  31. 31.15 × 4 =
  32. 32.60 × 4 =
  33. 33.18 × 4 =
  34. 34.34 × 8 =
  35. 35.72 × 4 =
  36. 36.25 × 4 =
  37. 37.27 × 8 =
  38. 38.13 × 4 =
  39. 39.24 × 4 =
  40. 40.46 × 4 =

Answer key

  1. 128
  2. 128
  3. 176
  4. 180
  5. 104
  6. 112
  7. 144
  8. 184
  9. 160
  10. 296
  11. 224
  12. 312
  13. 264
  14. 56
  15. 120
  16. 304
  17. 160
  18. 300
  19. 152
  20. 232
  21. 296
  22. 228
  23. 256
  24. 272
  25. 260
  26. 172
  27. 192
  28. 80
  29. 104
  30. 68
  31. 60
  32. 240
  33. 72
  34. 272
  35. 288
  36. 100
  37. 216
  38. 52
  39. 96
  40. 184

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