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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 841 · 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. 1.61 × 4 =
  2. 2.25 × 4 =
  3. 3.21 × 4 =
  4. 4.74 × 4 =
  5. 5.28 × 8 =
  6. 6.14 × 8 =
  7. 7.33 × 8 =
  8. 8.40 × 4 =
  9. 9.33 × 4 =
  10. 10.39 × 8 =
  11. 11.56 × 4 =
  12. 12.59 × 4 =
  13. 13.27 × 8 =
  14. 14.58 × 4 =
  15. 15.72 × 4 =
  16. 16.38 × 4 =
  17. 17.50 × 4 =
  18. 18.43 × 4 =
  19. 19.52 × 4 =
  20. 20.37 × 8 =
  21. 21.12 × 4 =
  22. 22.29 × 8 =
  23. 23.35 × 4 =
  24. 24.15 × 8 =
  25. 25.12 × 8 =
  26. 26.45 × 4 =
  27. 27.67 × 4 =
  28. 28.18 × 8 =
  29. 29.46 × 4 =
  30. 30.20 × 4 =
  31. 31.39 × 4 =
  32. 32.68 × 4 =
  33. 33.18 × 4 =
  34. 34.17 × 4 =
  35. 35.26 × 8 =
  36. 36.15 × 4 =
  37. 37.30 × 4 =
  38. 38.23 × 8 =
  39. 39.30 × 8 =
  40. 40.31 × 4 =

Answer key

  1. 244
  2. 100
  3. 84
  4. 296
  5. 224
  6. 112
  7. 264
  8. 160
  9. 132
  10. 312
  11. 224
  12. 236
  13. 216
  14. 232
  15. 288
  16. 152
  17. 200
  18. 172
  19. 208
  20. 296
  21. 48
  22. 232
  23. 140
  24. 120
  25. 96
  26. 180
  27. 268
  28. 144
  29. 184
  30. 80
  31. 156
  32. 272
  33. 72
  34. 68
  35. 208
  36. 60
  37. 120
  38. 184
  39. 240
  40. 124

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