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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 283 · 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. 1.27 × 15 =
  2. 2.23 × 24 =
  3. 3.34 × 12 =
  4. 4.49 × 18 =
  5. 5.26 × 12 =
  6. 6.21 × 14 =
  7. 7.41 × 18 =
  8. 8.46 × 15 =
  9. 9.41 × 15 =
  10. 10.33 × 24 =
  11. 11.12 × 15 =
  12. 12.44 × 16 =
  13. 13.23 × 14 =
  14. 14.27 × 24 =
  15. 15.18 × 15 =
  16. 16.24 × 14 =
  17. 17.36 × 14 =
  18. 18.16 × 15 =
  19. 19.35 × 18 =
  20. 20.25 × 18 =
  21. 21.31 × 16 =
  22. 22.19 × 18 =
  23. 23.13 × 24 =
  24. 24.41 × 12 =
  25. 25.45 × 14 =
  26. 26.43 × 14 =
  27. 27.36 × 12 =
  28. 28.17 × 14 =
  29. 29.13 × 12 =
  30. 30.46 × 12 =
  31. 31.44 × 18 =
  32. 32.19 × 24 =
  33. 33.38 × 15 =
  34. 34.29 × 15 =
  35. 35.35 × 14 =
  36. 36.16 × 14 =
  37. 37.39 × 15 =
  38. 38.35 × 24 =
  39. 39.21 × 15 =
  40. 40.41 × 16 =

Answer key

  1. 405
  2. 552
  3. 408
  4. 882
  5. 312
  6. 294
  7. 738
  8. 690
  9. 615
  10. 792
  11. 180
  12. 704
  13. 322
  14. 648
  15. 270
  16. 336
  17. 504
  18. 240
  19. 630
  20. 450
  21. 496
  22. 342
  23. 312
  24. 492
  25. 630
  26. 602
  27. 432
  28. 238
  29. 156
  30. 552
  31. 792
  32. 456
  33. 570
  34. 435
  35. 490
  36. 224
  37. 585
  38. 840
  39. 315
  40. 656

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