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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 603 · 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. 1.21 × 18 =
  2. 2.37 × 18 =
  3. 3.44 × 18 =
  4. 4.46 × 18 =
  5. 5.34 × 15 =
  6. 6.38 × 16 =
  7. 7.34 × 16 =
  8. 8.43 × 12 =
  9. 9.21 × 15 =
  10. 10.46 × 14 =
  11. 11.25 × 14 =
  12. 12.40 × 12 =
  13. 13.48 × 16 =
  14. 14.13 × 18 =
  15. 15.32 × 18 =
  16. 16.14 × 14 =
  17. 17.34 × 12 =
  18. 18.33 × 24 =
  19. 19.20 × 12 =
  20. 20.27 × 18 =
  21. 21.23 × 14 =
  22. 22.16 × 16 =
  23. 23.45 × 16 =
  24. 24.19 × 18 =
  25. 25.23 × 12 =
  26. 26.18 × 24 =
  27. 27.12 × 18 =
  28. 28.45 × 12 =
  29. 29.13 × 12 =
  30. 30.36 × 14 =
  31. 31.11 × 15 =
  32. 32.48 × 14 =
  33. 33.22 × 15 =
  34. 34.46 × 12 =
  35. 35.32 × 16 =
  36. 36.36 × 12 =
  37. 37.12 × 12 =
  38. 38.44 × 15 =
  39. 39.15 × 12 =
  40. 40.26 × 12 =

Answer key

  1. 378
  2. 666
  3. 792
  4. 828
  5. 510
  6. 608
  7. 544
  8. 516
  9. 315
  10. 644
  11. 350
  12. 480
  13. 768
  14. 234
  15. 576
  16. 196
  17. 408
  18. 792
  19. 240
  20. 486
  21. 322
  22. 256
  23. 720
  24. 342
  25. 276
  26. 432
  27. 216
  28. 540
  29. 156
  30. 504
  31. 165
  32. 672
  33. 330
  34. 552
  35. 512
  36. 432
  37. 144
  38. 660
  39. 180
  40. 312

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