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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 96 · 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. 1.16 × 14 =
  2. 2.43 × 15 =
  3. 3.26 × 15 =
  4. 4.28 × 16 =
  5. 5.33 × 14 =
  6. 6.25 × 24 =
  7. 7.19 × 14 =
  8. 8.24 × 18 =
  9. 9.26 × 14 =
  10. 10.31 × 14 =
  11. 11.11 × 15 =
  12. 12.38 × 16 =
  13. 13.17 × 24 =
  14. 14.49 × 14 =
  15. 15.46 × 18 =
  16. 16.47 × 12 =
  17. 17.44 × 14 =
  18. 18.16 × 18 =
  19. 19.26 × 18 =
  20. 20.14 × 16 =
  21. 21.13 × 12 =
  22. 22.44 × 16 =
  23. 23.20 × 18 =
  24. 24.24 × 15 =
  25. 25.15 × 12 =
  26. 26.13 × 14 =
  27. 27.25 × 12 =
  28. 28.18 × 12 =
  29. 29.34 × 12 =
  30. 30.16 × 16 =
  31. 31.20 × 12 =
  32. 32.22 × 14 =
  33. 33.27 × 18 =
  34. 34.47 × 15 =
  35. 35.44 × 18 =
  36. 36.48 × 12 =
  37. 37.19 × 18 =
  38. 38.21 × 24 =
  39. 39.15 × 14 =
  40. 40.47 × 14 =

Answer key

  1. 224
  2. 645
  3. 390
  4. 448
  5. 462
  6. 600
  7. 266
  8. 432
  9. 364
  10. 434
  11. 165
  12. 608
  13. 408
  14. 686
  15. 828
  16. 564
  17. 616
  18. 288
  19. 468
  20. 224
  21. 156
  22. 704
  23. 360
  24. 360
  25. 180
  26. 182
  27. 300
  28. 216
  29. 408
  30. 256
  31. 240
  32. 308
  33. 486
  34. 705
  35. 792
  36. 576
  37. 342
  38. 504
  39. 210
  40. 658

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