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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 29 · 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. 1.39 × 4 =
  2. 2.17 × 8 =
  3. 3.25 × 4 =
  4. 4.57 × 4 =
  5. 5.17 × 4 =
  6. 6.40 × 8 =
  7. 7.36 × 4 =
  8. 8.26 × 8 =
  9. 9.14 × 8 =
  10. 10.61 × 4 =
  11. 11.58 × 4 =
  12. 12.69 × 4 =
  13. 13.12 × 8 =
  14. 14.21 × 8 =
  15. 15.19 × 8 =
  16. 16.32 × 4 =
  17. 17.65 × 4 =
  18. 18.19 × 4 =
  19. 19.24 × 8 =
  20. 20.20 × 8 =
  21. 21.35 × 8 =
  22. 22.45 × 4 =
  23. 23.47 × 4 =
  24. 24.21 × 4 =
  25. 25.64 × 4 =
  26. 26.44 × 4 =
  27. 27.39 × 8 =
  28. 28.33 × 4 =
  29. 29.12 × 4 =
  30. 30.15 × 8 =
  31. 31.33 × 8 =
  32. 32.22 × 4 =
  33. 33.29 × 4 =
  34. 34.34 × 8 =
  35. 35.32 × 8 =
  36. 36.13 × 8 =
  37. 37.63 × 4 =
  38. 38.75 × 4 =
  39. 39.16 × 8 =
  40. 40.31 × 4 =

Answer key

  1. 156
  2. 136
  3. 100
  4. 228
  5. 68
  6. 320
  7. 144
  8. 208
  9. 112
  10. 244
  11. 232
  12. 276
  13. 96
  14. 168
  15. 152
  16. 128
  17. 260
  18. 76
  19. 192
  20. 160
  21. 280
  22. 180
  23. 188
  24. 84
  25. 256
  26. 176
  27. 312
  28. 132
  29. 48
  30. 120
  31. 264
  32. 88
  33. 116
  34. 272
  35. 256
  36. 104
  37. 252
  38. 300
  39. 128
  40. 124

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