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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 21 · 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. 1.13 × 18 =
  2. 2.16 × 14 =
  3. 3.21 × 15 =
  4. 4.43 × 14 =
  5. 5.38 × 15 =
  6. 6.40 × 12 =
  7. 7.48 × 12 =
  8. 8.47 × 16 =
  9. 9.19 × 14 =
  10. 10.49 × 15 =
  11. 11.20 × 15 =
  12. 12.11 × 16 =
  13. 13.42 × 12 =
  14. 14.47 × 14 =
  15. 15.20 × 12 =
  16. 16.37 × 18 =
  17. 17.24 × 12 =
  18. 18.48 × 18 =
  19. 19.26 × 15 =
  20. 20.41 × 24 =
  21. 21.25 × 16 =
  22. 22.37 × 16 =
  23. 23.22 × 18 =
  24. 24.15 × 14 =
  25. 25.35 × 12 =
  26. 26.18 × 24 =
  27. 27.13 × 16 =
  28. 28.21 × 16 =
  29. 29.27 × 24 =
  30. 30.44 × 15 =
  31. 31.23 × 12 =
  32. 32.49 × 12 =
  33. 33.22 × 15 =
  34. 34.19 × 12 =
  35. 35.39 × 24 =
  36. 36.34 × 15 =
  37. 37.35 × 14 =
  38. 38.35 × 18 =
  39. 39.33 × 12 =
  40. 40.11 × 12 =

Answer key

  1. 234
  2. 224
  3. 315
  4. 602
  5. 570
  6. 480
  7. 576
  8. 752
  9. 266
  10. 735
  11. 300
  12. 176
  13. 504
  14. 658
  15. 240
  16. 666
  17. 288
  18. 864
  19. 390
  20. 984
  21. 400
  22. 592
  23. 396
  24. 210
  25. 420
  26. 432
  27. 208
  28. 336
  29. 648
  30. 660
  31. 276
  32. 588
  33. 330
  34. 228
  35. 936
  36. 510
  37. 490
  38. 630
  39. 396
  40. 132

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