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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 607 · 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. 1.26 × 15 =
  2. 2.11 × 24 =
  3. 3.44 × 12 =
  4. 4.44 × 16 =
  5. 5.40 × 12 =
  6. 6.37 × 14 =
  7. 7.31 × 18 =
  8. 8.42 × 14 =
  9. 9.11 × 12 =
  10. 10.16 × 16 =
  11. 11.35 × 18 =
  12. 12.33 × 24 =
  13. 13.13 × 12 =
  14. 14.20 × 12 =
  15. 15.40 × 18 =
  16. 16.20 × 24 =
  17. 17.14 × 16 =
  18. 18.27 × 15 =
  19. 19.38 × 16 =
  20. 20.36 × 14 =
  21. 21.14 × 12 =
  22. 22.29 × 14 =
  23. 23.25 × 16 =
  24. 24.47 × 18 =
  25. 25.46 × 16 =
  26. 26.28 × 16 =
  27. 27.49 × 14 =
  28. 28.12 × 15 =
  29. 29.16 × 15 =
  30. 30.28 × 15 =
  31. 31.28 × 14 =
  32. 32.21 × 14 =
  33. 33.47 × 16 =
  34. 34.45 × 16 =
  35. 35.43 × 12 =
  36. 36.18 × 12 =
  37. 37.15 × 12 =
  38. 38.12 × 12 =
  39. 39.24 × 16 =
  40. 40.19 × 24 =

Answer key

  1. 390
  2. 264
  3. 528
  4. 704
  5. 480
  6. 518
  7. 558
  8. 588
  9. 132
  10. 256
  11. 630
  12. 792
  13. 156
  14. 240
  15. 720
  16. 480
  17. 224
  18. 405
  19. 608
  20. 504
  21. 168
  22. 406
  23. 400
  24. 846
  25. 736
  26. 448
  27. 686
  28. 180
  29. 240
  30. 420
  31. 392
  32. 294
  33. 752
  34. 720
  35. 516
  36. 216
  37. 180
  38. 144
  39. 384
  40. 456

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