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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 772 · 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. 1.35 × 15 =
  2. 2.16 × 18 =
  3. 3.14 × 15 =
  4. 4.11 × 18 =
  5. 5.19 × 18 =
  6. 6.44 × 14 =
  7. 7.41 × 12 =
  8. 8.23 × 15 =
  9. 9.14 × 14 =
  10. 10.18 × 18 =
  11. 11.21 × 14 =
  12. 12.22 × 14 =
  13. 13.23 × 12 =
  14. 14.11 × 15 =
  15. 15.17 × 18 =
  16. 16.40 × 12 =
  17. 17.25 × 24 =
  18. 18.46 × 18 =
  19. 19.13 × 16 =
  20. 20.31 × 14 =
  21. 21.46 × 12 =
  22. 22.19 × 14 =
  23. 23.38 × 12 =
  24. 24.26 × 12 =
  25. 25.30 × 18 =
  26. 26.33 × 16 =
  27. 27.48 × 12 =
  28. 28.18 × 24 =
  29. 29.43 × 12 =
  30. 30.15 × 14 =
  31. 31.20 × 12 =
  32. 32.13 × 18 =
  33. 33.17 × 12 =
  34. 34.19 × 24 =
  35. 35.31 × 15 =
  36. 36.13 × 15 =
  37. 37.38 × 15 =
  38. 38.11 × 24 =
  39. 39.19 × 16 =
  40. 40.12 × 18 =

Answer key

  1. 525
  2. 288
  3. 210
  4. 198
  5. 342
  6. 616
  7. 492
  8. 345
  9. 196
  10. 324
  11. 294
  12. 308
  13. 276
  14. 165
  15. 306
  16. 480
  17. 600
  18. 828
  19. 208
  20. 434
  21. 552
  22. 266
  23. 456
  24. 312
  25. 540
  26. 528
  27. 576
  28. 432
  29. 516
  30. 210
  31. 240
  32. 234
  33. 204
  34. 456
  35. 465
  36. 195
  37. 570
  38. 264
  39. 304
  40. 216

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