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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 826 · 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 × 8 =
  2. 2.24 × 8 =
  3. 3.67 × 4 =
  4. 4.70 × 4 =
  5. 5.71 × 4 =
  6. 6.20 × 8 =
  7. 7.16 × 4 =
  8. 8.27 × 8 =
  9. 9.21 × 4 =
  10. 10.33 × 4 =
  11. 11.47 × 4 =
  12. 12.36 × 4 =
  13. 13.30 × 8 =
  14. 14.54 × 4 =
  15. 15.34 × 4 =
  16. 16.13 × 8 =
  17. 17.40 × 8 =
  18. 18.30 × 4 =
  19. 19.55 × 4 =
  20. 20.16 × 8 =
  21. 21.28 × 8 =
  22. 22.17 × 8 =
  23. 23.34 × 8 =
  24. 24.75 × 4 =
  25. 25.53 × 4 =
  26. 26.18 × 4 =
  27. 27.21 × 8 =
  28. 28.19 × 8 =
  29. 29.41 × 4 =
  30. 30.65 × 4 =
  31. 31.14 × 4 =
  32. 32.31 × 8 =
  33. 33.15 × 4 =
  34. 34.33 × 8 =
  35. 35.68 × 4 =
  36. 36.69 × 4 =
  37. 37.51 × 4 =
  38. 38.26 × 4 =
  39. 39.23 × 4 =
  40. 40.15 × 8 =

Answer key

  1. 312
  2. 192
  3. 268
  4. 280
  5. 284
  6. 160
  7. 64
  8. 216
  9. 84
  10. 132
  11. 188
  12. 144
  13. 240
  14. 216
  15. 136
  16. 104
  17. 320
  18. 120
  19. 220
  20. 128
  21. 224
  22. 136
  23. 272
  24. 300
  25. 212
  26. 72
  27. 168
  28. 152
  29. 164
  30. 260
  31. 56
  32. 248
  33. 60
  34. 264
  35. 272
  36. 276
  37. 204
  38. 104
  39. 92
  40. 120

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