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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 936 · 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. 1.14 × 15 =
  2. 2.40 × 15 =
  3. 3.27 × 18 =
  4. 4.26 × 24 =
  5. 5.23 × 14 =
  6. 6.17 × 24 =
  7. 7.41 × 12 =
  8. 8.41 × 24 =
  9. 9.19 × 16 =
  10. 10.13 × 24 =
  11. 11.41 × 15 =
  12. 12.33 × 12 =
  13. 13.23 × 15 =
  14. 14.24 × 16 =
  15. 15.29 × 14 =
  16. 16.36 × 12 =
  17. 17.22 × 24 =
  18. 18.38 × 24 =
  19. 19.11 × 12 =
  20. 20.48 × 15 =
  21. 21.14 × 18 =
  22. 22.45 × 14 =
  23. 23.18 × 14 =
  24. 24.33 × 16 =
  25. 25.36 × 18 =
  26. 26.15 × 14 =
  27. 27.11 × 24 =
  28. 28.34 × 15 =
  29. 29.12 × 14 =
  30. 30.49 × 18 =
  31. 31.37 × 16 =
  32. 32.11 × 15 =
  33. 33.20 × 15 =
  34. 34.31 × 14 =
  35. 35.16 × 24 =
  36. 36.45 × 16 =
  37. 37.20 × 14 =
  38. 38.29 × 15 =
  39. 39.21 × 16 =
  40. 40.32 × 12 =

Answer key

  1. 210
  2. 600
  3. 486
  4. 624
  5. 322
  6. 408
  7. 492
  8. 984
  9. 304
  10. 312
  11. 615
  12. 396
  13. 345
  14. 384
  15. 406
  16. 432
  17. 528
  18. 912
  19. 132
  20. 720
  21. 252
  22. 630
  23. 252
  24. 528
  25. 648
  26. 210
  27. 264
  28. 510
  29. 168
  30. 882
  31. 592
  32. 165
  33. 300
  34. 434
  35. 384
  36. 720
  37. 280
  38. 435
  39. 336
  40. 384

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