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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 494 · 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. 1.23 × 4 =
  2. 2.21 × 4 =
  3. 3.36 × 4 =
  4. 4.14 × 8 =
  5. 5.30 × 8 =
  6. 6.20 × 4 =
  7. 7.36 × 8 =
  8. 8.34 × 8 =
  9. 9.40 × 8 =
  10. 10.68 × 4 =
  11. 11.16 × 8 =
  12. 12.21 × 8 =
  13. 13.60 × 4 =
  14. 14.18 × 4 =
  15. 15.15 × 8 =
  16. 16.13 × 4 =
  17. 17.35 × 8 =
  18. 18.12 × 8 =
  19. 19.27 × 8 =
  20. 20.32 × 4 =
  21. 21.29 × 8 =
  22. 22.42 × 4 =
  23. 23.18 × 8 =
  24. 24.33 × 4 =
  25. 25.28 × 8 =
  26. 26.63 × 4 =
  27. 27.51 × 4 =
  28. 28.19 × 8 =
  29. 29.40 × 4 =
  30. 30.26 × 8 =
  31. 31.23 × 8 =
  32. 32.74 × 4 =
  33. 33.20 × 8 =
  34. 34.39 × 4 =
  35. 35.59 × 4 =
  36. 36.52 × 4 =
  37. 37.65 × 4 =
  38. 38.17 × 4 =
  39. 39.35 × 4 =
  40. 40.61 × 4 =

Answer key

  1. 92
  2. 84
  3. 144
  4. 112
  5. 240
  6. 80
  7. 288
  8. 272
  9. 320
  10. 272
  11. 128
  12. 168
  13. 240
  14. 72
  15. 120
  16. 52
  17. 280
  18. 96
  19. 216
  20. 128
  21. 232
  22. 168
  23. 144
  24. 132
  25. 224
  26. 252
  27. 204
  28. 152
  29. 160
  30. 208
  31. 184
  32. 296
  33. 160
  34. 156
  35. 236
  36. 208
  37. 260
  38. 68
  39. 140
  40. 244

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