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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 310 · 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. 1.28 × 15 =
  2. 2.19 × 15 =
  3. 3.11 × 15 =
  4. 4.30 × 14 =
  5. 5.42 × 15 =
  6. 6.26 × 16 =
  7. 7.48 × 12 =
  8. 8.12 × 12 =
  9. 9.41 × 12 =
  10. 10.36 × 12 =
  11. 11.23 × 14 =
  12. 12.40 × 16 =
  13. 13.45 × 18 =
  14. 14.19 × 12 =
  15. 15.17 × 14 =
  16. 16.32 × 12 =
  17. 17.44 × 16 =
  18. 18.30 × 18 =
  19. 19.30 × 16 =
  20. 20.22 × 15 =
  21. 21.26 × 14 =
  22. 22.11 × 24 =
  23. 23.44 × 15 =
  24. 24.36 × 14 =
  25. 25.17 × 12 =
  26. 26.20 × 24 =
  27. 27.47 × 12 =
  28. 28.20 × 16 =
  29. 29.18 × 14 =
  30. 30.45 × 12 =
  31. 31.18 × 16 =
  32. 32.40 × 14 =
  33. 33.14 × 16 =
  34. 34.11 × 12 =
  35. 35.25 × 15 =
  36. 36.17 × 18 =
  37. 37.48 × 18 =
  38. 38.31 × 15 =
  39. 39.43 × 15 =
  40. 40.45 × 16 =

Answer key

  1. 420
  2. 285
  3. 165
  4. 420
  5. 630
  6. 416
  7. 576
  8. 144
  9. 492
  10. 432
  11. 322
  12. 640
  13. 810
  14. 228
  15. 238
  16. 384
  17. 704
  18. 540
  19. 480
  20. 330
  21. 364
  22. 264
  23. 660
  24. 504
  25. 204
  26. 480
  27. 564
  28. 320
  29. 252
  30. 540
  31. 288
  32. 560
  33. 224
  34. 132
  35. 375
  36. 306
  37. 864
  38. 465
  39. 645
  40. 720

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