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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 347 · 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. 1.16 × 8 =
  2. 2.15 × 4 =
  3. 3.42 × 4 =
  4. 4.22 × 8 =
  5. 5.52 × 4 =
  6. 6.18 × 8 =
  7. 7.51 × 4 =
  8. 8.75 × 4 =
  9. 9.19 × 8 =
  10. 10.35 × 8 =
  11. 11.29 × 8 =
  12. 12.21 × 8 =
  13. 13.35 × 4 =
  14. 14.17 × 4 =
  15. 15.40 × 8 =
  16. 16.38 × 8 =
  17. 17.34 × 8 =
  18. 18.49 × 4 =
  19. 19.39 × 8 =
  20. 20.72 × 4 =
  21. 21.28 × 8 =
  22. 22.15 × 8 =
  23. 23.17 × 8 =
  24. 24.16 × 4 =
  25. 25.13 × 4 =
  26. 26.13 × 8 =
  27. 27.26 × 8 =
  28. 28.14 × 8 =
  29. 29.27 × 8 =
  30. 30.27 × 4 =
  31. 31.67 × 4 =
  32. 32.61 × 4 =
  33. 33.44 × 4 =
  34. 34.30 × 4 =
  35. 35.34 × 4 =
  36. 36.37 × 8 =
  37. 37.12 × 4 =
  38. 38.57 × 4 =
  39. 39.31 × 8 =
  40. 40.50 × 4 =

Answer key

  1. 128
  2. 60
  3. 168
  4. 176
  5. 208
  6. 144
  7. 204
  8. 300
  9. 152
  10. 280
  11. 232
  12. 168
  13. 140
  14. 68
  15. 320
  16. 304
  17. 272
  18. 196
  19. 312
  20. 288
  21. 224
  22. 120
  23. 136
  24. 64
  25. 52
  26. 104
  27. 208
  28. 112
  29. 216
  30. 108
  31. 268
  32. 244
  33. 176
  34. 120
  35. 136
  36. 296
  37. 48
  38. 228
  39. 248
  40. 200

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