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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 2 · 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. 1.21 × 8 =
  2. 2.19 × 4 =
  3. 3.26 × 4 =
  4. 4.15 × 8 =
  5. 5.28 × 4 =
  6. 6.38 × 8 =
  7. 7.54 × 4 =
  8. 8.16 × 4 =
  9. 9.46 × 4 =
  10. 10.33 × 8 =
  11. 11.35 × 4 =
  12. 12.28 × 8 =
  13. 13.31 × 8 =
  14. 14.17 × 4 =
  15. 15.59 × 4 =
  16. 16.21 × 4 =
  17. 17.53 × 4 =
  18. 18.40 × 8 =
  19. 19.32 × 8 =
  20. 20.20 × 4 =
  21. 21.13 × 8 =
  22. 22.41 × 4 =
  23. 23.34 × 8 =
  24. 24.69 × 4 =
  25. 25.22 × 4 =
  26. 26.16 × 8 =
  27. 27.20 × 8 =
  28. 28.25 × 8 =
  29. 29.72 × 4 =
  30. 30.14 × 8 =
  31. 31.23 × 8 =
  32. 32.51 × 4 =
  33. 33.52 × 4 =
  34. 34.44 × 4 =
  35. 35.24 × 4 =
  36. 36.45 × 4 =
  37. 37.23 × 4 =
  38. 38.38 × 4 =
  39. 39.18 × 8 =
  40. 40.14 × 4 =

Answer key

  1. 168
  2. 76
  3. 104
  4. 120
  5. 112
  6. 304
  7. 216
  8. 64
  9. 184
  10. 264
  11. 140
  12. 224
  13. 248
  14. 68
  15. 236
  16. 84
  17. 212
  18. 320
  19. 256
  20. 80
  21. 104
  22. 164
  23. 272
  24. 276
  25. 88
  26. 128
  27. 160
  28. 200
  29. 288
  30. 112
  31. 184
  32. 204
  33. 208
  34. 176
  35. 96
  36. 180
  37. 92
  38. 152
  39. 144
  40. 56

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