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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 141 · 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. 1.34 × 16 =
  2. 2.38 × 14 =
  3. 3.27 × 16 =
  4. 4.23 × 18 =
  5. 5.45 × 18 =
  6. 6.16 × 15 =
  7. 7.22 × 15 =
  8. 8.21 × 16 =
  9. 9.11 × 15 =
  10. 10.46 × 15 =
  11. 11.30 × 16 =
  12. 12.49 × 16 =
  13. 13.48 × 12 =
  14. 14.35 × 24 =
  15. 15.21 × 12 =
  16. 16.21 × 18 =
  17. 17.42 × 18 =
  18. 18.20 × 16 =
  19. 19.18 × 12 =
  20. 20.16 × 18 =
  21. 21.16 × 16 =
  22. 22.25 × 12 =
  23. 23.24 × 14 =
  24. 24.41 × 12 =
  25. 25.49 × 14 =
  26. 26.22 × 24 =
  27. 27.25 × 24 =
  28. 28.19 × 15 =
  29. 29.41 × 15 =
  30. 30.11 × 14 =
  31. 31.46 × 18 =
  32. 32.19 × 16 =
  33. 33.14 × 12 =
  34. 34.17 × 14 =
  35. 35.28 × 12 =
  36. 36.26 × 14 =
  37. 37.20 × 14 =
  38. 38.19 × 24 =
  39. 39.11 × 18 =
  40. 40.45 × 15 =

Answer key

  1. 544
  2. 532
  3. 432
  4. 414
  5. 810
  6. 240
  7. 330
  8. 336
  9. 165
  10. 690
  11. 480
  12. 784
  13. 576
  14. 840
  15. 252
  16. 378
  17. 756
  18. 320
  19. 216
  20. 288
  21. 256
  22. 300
  23. 336
  24. 492
  25. 686
  26. 528
  27. 600
  28. 285
  29. 615
  30. 154
  31. 828
  32. 304
  33. 168
  34. 238
  35. 336
  36. 364
  37. 280
  38. 456
  39. 198
  40. 675

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