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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 138 · 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. 1.46 × 4 =
  2. 2.62 × 4 =
  3. 3.40 × 8 =
  4. 4.26 × 8 =
  5. 5.16 × 8 =
  6. 6.18 × 4 =
  7. 7.27 × 8 =
  8. 8.55 × 4 =
  9. 9.42 × 4 =
  10. 10.57 × 4 =
  11. 11.15 × 8 =
  12. 12.44 × 4 =
  13. 13.17 × 4 =
  14. 14.63 × 4 =
  15. 15.18 × 8 =
  16. 16.24 × 8 =
  17. 17.36 × 8 =
  18. 18.12 × 8 =
  19. 19.19 × 8 =
  20. 20.37 × 8 =
  21. 21.19 × 4 =
  22. 22.74 × 4 =
  23. 23.43 × 4 =
  24. 24.60 × 4 =
  25. 25.15 × 4 =
  26. 26.17 × 8 =
  27. 27.13 × 4 =
  28. 28.35 × 4 =
  29. 29.29 × 4 =
  30. 30.39 × 8 =
  31. 31.14 × 8 =
  32. 32.31 × 8 =
  33. 33.21 × 8 =
  34. 34.47 × 4 =
  35. 35.39 × 4 =
  36. 36.22 × 8 =
  37. 37.28 × 4 =
  38. 38.22 × 4 =
  39. 39.34 × 8 =
  40. 40.56 × 4 =

Answer key

  1. 184
  2. 248
  3. 320
  4. 208
  5. 128
  6. 72
  7. 216
  8. 220
  9. 168
  10. 228
  11. 120
  12. 176
  13. 68
  14. 252
  15. 144
  16. 192
  17. 288
  18. 96
  19. 152
  20. 296
  21. 76
  22. 296
  23. 172
  24. 240
  25. 60
  26. 136
  27. 52
  28. 140
  29. 116
  30. 312
  31. 112
  32. 248
  33. 168
  34. 188
  35. 156
  36. 176
  37. 112
  38. 88
  39. 272
  40. 224

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