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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 914 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.23 × 15 =
  2. 2.18 × 14 =
  3. 3.44 × 16 =
  4. 4.39 × 18 =
  5. 5.24 × 14 =
  6. 6.12 × 18 =
  7. 7.26 × 12 =
  8. 8.31 × 14 =
  9. 9.31 × 24 =
  10. 10.29 × 24 =
  11. 11.28 × 16 =
  12. 12.38 × 15 =
  13. 13.20 × 24 =
  14. 14.39 × 15 =
  15. 15.41 × 18 =
  16. 16.19 × 12 =
  17. 17.23 × 12 =
  18. 18.15 × 18 =
  19. 19.13 × 14 =
  20. 20.30 × 14 =
  21. 21.11 × 12 =
  22. 22.22 × 14 =
  23. 23.48 × 14 =
  24. 24.18 × 16 =
  25. 25.23 × 24 =
  26. 26.40 × 12 =
  27. 27.31 × 16 =
  28. 28.13 × 16 =
  29. 29.12 × 12 =
  30. 30.30 × 16 =
  31. 31.25 × 18 =
  32. 32.21 × 12 =
  33. 33.47 × 18 =
  34. 34.45 × 16 =
  35. 35.36 × 15 =
  36. 36.11 × 24 =
  37. 37.40 × 24 =
  38. 38.43 × 18 =
  39. 39.43 × 15 =
  40. 40.27 × 12 =

Answer key

  1. 345
  2. 252
  3. 704
  4. 702
  5. 336
  6. 216
  7. 312
  8. 434
  9. 744
  10. 696
  11. 448
  12. 570
  13. 480
  14. 585
  15. 738
  16. 228
  17. 276
  18. 270
  19. 182
  20. 420
  21. 132
  22. 308
  23. 672
  24. 288
  25. 552
  26. 480
  27. 496
  28. 208
  29. 144
  30. 480
  31. 450
  32. 252
  33. 846
  34. 720
  35. 540
  36. 264
  37. 960
  38. 774
  39. 645
  40. 324

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