Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 64 · 40 questions

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).

1. 1.11 × 14 =
2. 2.14 × 14 =
3. 3.25 × 14 =
4. 4.37 × 18 =
5. 5.24 × 12 =
6. 6.31 × 16 =
7. 7.14 × 24 =
8. 8.45 × 16 =
9. 9.17 × 16 =
10. 10.28 × 16 =
11. 11.48 × 18 =
12. 12.38 × 14 =
13. 13.21 × 12 =
14. 14.30 × 12 =
15. 15.45 × 18 =
16. 16.12 × 18 =
17. 17.39 × 14 =
18. 18.42 × 16 =
19. 19.26 × 12 =
20. 20.25 × 24 =
21. 21.37 × 15 =
22. 22.34 × 15 =
23. 23.13 × 12 =
24. 24.49 × 12 =
25. 25.20 × 18 =
26. 26.13 × 16 =
27. 27.27 × 14 =
28. 28.36 × 16 =
29. 29.38 × 15 =
30. 30.40 × 15 =
31. 31.34 × 18 =
32. 32.28 × 12 =
33. 33.23 × 18 =
34. 34.47 × 24 =
35. 35.12 × 15 =
36. 36.41 × 12 =
37. 37.17 × 24 =
38. 38.12 × 14 =
39. 39.28 × 18 =
40. 40.27 × 16 =

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