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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 671 · 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. 1.14 × 4 =
  2. 2.34 × 8 =
  3. 3.17 × 4 =
  4. 4.30 × 4 =
  5. 5.20 × 4 =
  6. 6.38 × 4 =
  7. 7.27 × 8 =
  8. 8.33 × 8 =
  9. 9.21 × 8 =
  10. 10.37 × 8 =
  11. 11.22 × 8 =
  12. 12.52 × 4 =
  13. 13.13 × 8 =
  14. 14.67 × 4 =
  15. 15.32 × 4 =
  16. 16.63 × 4 =
  17. 17.53 × 4 =
  18. 18.68 × 4 =
  19. 19.26 × 8 =
  20. 20.42 × 4 =
  21. 21.66 × 4 =
  22. 22.14 × 8 =
  23. 23.73 × 4 =
  24. 24.23 × 8 =
  25. 25.17 × 8 =
  26. 26.27 × 4 =
  27. 27.28 × 8 =
  28. 28.38 × 8 =
  29. 29.26 × 4 =
  30. 30.20 × 8 =
  31. 31.15 × 8 =
  32. 32.18 × 4 =
  33. 33.46 × 4 =
  34. 34.57 × 4 =
  35. 35.75 × 4 =
  36. 36.31 × 8 =
  37. 37.60 × 4 =
  38. 38.32 × 8 =
  39. 39.12 × 8 =
  40. 40.31 × 4 =

Answer key

  1. 56
  2. 272
  3. 68
  4. 120
  5. 80
  6. 152
  7. 216
  8. 264
  9. 168
  10. 296
  11. 176
  12. 208
  13. 104
  14. 268
  15. 128
  16. 252
  17. 212
  18. 272
  19. 208
  20. 168
  21. 264
  22. 112
  23. 292
  24. 184
  25. 136
  26. 108
  27. 224
  28. 304
  29. 104
  30. 160
  31. 120
  32. 72
  33. 184
  34. 228
  35. 300
  36. 248
  37. 240
  38. 256
  39. 96
  40. 124

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