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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 38 · 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. 1.15 × 12 =
  2. 2.19 × 18 =
  3. 3.47 × 15 =
  4. 4.17 × 18 =
  5. 5.44 × 18 =
  6. 6.44 × 16 =
  7. 7.35 × 24 =
  8. 8.30 × 14 =
  9. 9.42 × 15 =
  10. 10.18 × 12 =
  11. 11.30 × 15 =
  12. 12.14 × 24 =
  13. 13.12 × 24 =
  14. 14.24 × 15 =
  15. 15.12 × 12 =
  16. 16.37 × 16 =
  17. 17.16 × 12 =
  18. 18.14 × 14 =
  19. 19.39 × 14 =
  20. 20.40 × 15 =
  21. 21.46 × 18 =
  22. 22.11 × 12 =
  23. 23.36 × 16 =
  24. 24.27 × 15 =
  25. 25.26 × 15 =
  26. 26.18 × 15 =
  27. 27.20 × 18 =
  28. 28.30 × 12 =
  29. 29.43 × 12 =
  30. 30.34 × 18 =
  31. 31.12 × 18 =
  32. 32.13 × 15 =
  33. 33.32 × 14 =
  34. 34.31 × 24 =
  35. 35.37 × 14 =
  36. 36.31 × 16 =
  37. 37.35 × 14 =
  38. 38.40 × 18 =
  39. 39.25 × 12 =
  40. 40.36 × 24 =

Answer key

  1. 180
  2. 342
  3. 705
  4. 306
  5. 792
  6. 704
  7. 840
  8. 420
  9. 630
  10. 216
  11. 450
  12. 336
  13. 288
  14. 360
  15. 144
  16. 592
  17. 192
  18. 196
  19. 546
  20. 600
  21. 828
  22. 132
  23. 576
  24. 405
  25. 390
  26. 270
  27. 360
  28. 360
  29. 516
  30. 612
  31. 216
  32. 195
  33. 448
  34. 744
  35. 518
  36. 496
  37. 490
  38. 720
  39. 300
  40. 864

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