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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 709 · 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. 1.39 × 15 =
  2. 2.19 × 24 =
  3. 3.16 × 14 =
  4. 4.30 × 15 =
  5. 5.21 × 14 =
  6. 6.35 × 12 =
  7. 7.12 × 18 =
  8. 8.31 × 15 =
  9. 9.39 × 16 =
  10. 10.25 × 15 =
  11. 11.21 × 16 =
  12. 12.18 × 12 =
  13. 13.29 × 24 =
  14. 14.41 × 12 =
  15. 15.20 × 12 =
  16. 16.15 × 16 =
  17. 17.40 × 15 =
  18. 18.23 × 16 =
  19. 19.12 × 15 =
  20. 20.39 × 12 =
  21. 21.14 × 12 =
  22. 22.16 × 24 =
  23. 23.17 × 16 =
  24. 24.39 × 18 =
  25. 25.40 × 14 =
  26. 26.40 × 24 =
  27. 27.34 × 18 =
  28. 28.25 × 12 =
  29. 29.22 × 12 =
  30. 30.32 × 16 =
  31. 31.38 × 12 =
  32. 32.41 × 15 =
  33. 33.39 × 14 =
  34. 34.21 × 15 =
  35. 35.34 × 24 =
  36. 36.43 × 18 =
  37. 37.38 × 16 =
  38. 38.33 × 16 =
  39. 39.30 × 14 =
  40. 40.30 × 18 =

Answer key

  1. 585
  2. 456
  3. 224
  4. 450
  5. 294
  6. 420
  7. 216
  8. 465
  9. 624
  10. 375
  11. 336
  12. 216
  13. 696
  14. 492
  15. 240
  16. 240
  17. 600
  18. 368
  19. 180
  20. 468
  21. 168
  22. 384
  23. 272
  24. 702
  25. 560
  26. 960
  27. 612
  28. 300
  29. 264
  30. 512
  31. 456
  32. 615
  33. 546
  34. 315
  35. 816
  36. 774
  37. 608
  38. 528
  39. 420
  40. 540

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