Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 654 · 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. 1.13 × 15 =
2. 2.25 × 14 =
3. 3.34 × 12 =
4. 4.15 × 18 =
5. 5.25 × 12 =
6. 6.12 × 16 =
7. 7.15 × 16 =
8. 8.13 × 12 =
9. 9.20 × 15 =
10. 10.31 × 12 =
11. 11.16 × 18 =
12. 12.27 × 15 =
13. 13.44 × 16 =
14. 14.35 × 16 =
15. 15.12 × 12 =
16. 16.14 × 18 =
17. 17.31 × 15 =
18. 18.21 × 15 =
19. 19.40 × 16 =
20. 20.18 × 15 =
21. 21.27 × 16 =
22. 22.15 × 14 =
23. 23.19 × 14 =
24. 24.39 × 12 =
25. 25.31 × 14 =
26. 26.16 × 15 =
27. 27.17 × 18 =
28. 28.23 × 12 =
29. 29.34 × 14 =
30. 30.26 × 24 =
31. 31.16 × 14 =
32. 32.28 × 16 =
33. 33.33 × 12 =
34. 34.28 × 14 =
35. 35.16 × 12 =
36. 36.35 × 18 =
37. 37.32 × 14 =
38. 38.35 × 12 =
39. 39.49 × 12 =
40. 40.44 × 15 =

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