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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 776 · 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 × 18 =
  2. 2.25 × 24 =
  3. 3.37 × 16 =
  4. 4.18 × 15 =
  5. 5.31 × 18 =
  6. 6.41 × 12 =
  7. 7.25 × 15 =
  8. 8.30 × 16 =
  9. 9.11 × 12 =
  10. 10.26 × 14 =
  11. 11.19 × 12 =
  12. 12.30 × 12 =
  13. 13.44 × 14 =
  14. 14.13 × 12 =
  15. 15.15 × 14 =
  16. 16.25 × 16 =
  17. 17.32 × 16 =
  18. 18.45 × 15 =
  19. 19.31 × 14 =
  20. 20.36 × 16 =
  21. 21.23 × 24 =
  22. 22.13 × 18 =
  23. 23.15 × 15 =
  24. 24.48 × 18 =
  25. 25.29 × 18 =
  26. 26.17 × 16 =
  27. 27.31 × 12 =
  28. 28.23 × 15 =
  29. 29.36 × 15 =
  30. 30.36 × 24 =
  31. 31.34 × 12 =
  32. 32.32 × 15 =
  33. 33.35 × 12 =
  34. 34.20 × 14 =
  35. 35.20 × 15 =
  36. 36.19 × 24 =
  37. 37.35 × 24 =
  38. 38.43 × 14 =
  39. 39.12 × 14 =
  40. 40.35 × 14 =

Answer key

  1. 504
  2. 600
  3. 592
  4. 270
  5. 558
  6. 492
  7. 375
  8. 480
  9. 132
  10. 364
  11. 228
  12. 360
  13. 616
  14. 156
  15. 210
  16. 400
  17. 512
  18. 675
  19. 434
  20. 576
  21. 552
  22. 234
  23. 225
  24. 864
  25. 522
  26. 272
  27. 372
  28. 345
  29. 540
  30. 864
  31. 408
  32. 480
  33. 420
  34. 280
  35. 300
  36. 456
  37. 840
  38. 602
  39. 168
  40. 490

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