Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 496 · 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. 1.18 × 15 =
2. 2.26 × 24 =
3. 3.47 × 16 =
4. 4.25 × 16 =
5. 5.15 × 18 =
6. 6.13 × 24 =
7. 7.31 × 12 =
8. 8.18 × 18 =
9. 9.44 × 18 =
10. 10.28 × 18 =
11. 11.11 × 12 =
12. 12.35 × 16 =
13. 13.39 × 14 =
14. 14.22 × 14 =
15. 15.14 × 14 =
16. 16.24 × 16 =
17. 17.39 × 24 =
18. 18.23 × 12 =
19. 19.23 × 18 =
20. 20.12 × 12 =
21. 21.48 × 14 =
22. 22.33 × 18 =
23. 23.19 × 18 =
24. 24.44 × 24 =
25. 25.30 × 24 =
26. 26.40 × 14 =
27. 27.43 × 16 =
28. 28.21 × 24 =
29. 29.29 × 12 =
30. 30.18 × 14 =
31. 31.44 × 12 =
32. 32.24 × 24 =
33. 33.19 × 14 =
34. 34.27 × 16 =
35. 35.14 × 15 =
36. 36.32 × 15 =
37. 37.14 × 16 =
38. 38.24 × 12 =
39. 39.42 × 24 =
40. 40.25 × 14 =

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