Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 549 · 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 × 12 =
2. 2.14 × 16 =
3. 3.49 × 15 =
4. 4.49 × 14 =
5. 5.24 × 18 =
6. 6.22 × 18 =
7. 7.20 × 12 =
8. 8.35 × 24 =
9. 9.37 × 12 =
10. 10.30 × 12 =
11. 11.39 × 12 =
12. 12.42 × 18 =
13. 13.35 × 18 =
14. 14.48 × 12 =
15. 15.40 × 14 =
16. 16.49 × 24 =
17. 17.25 × 16 =
18. 18.31 × 12 =
19. 19.34 × 14 =
20. 20.30 × 24 =
21. 21.12 × 24 =
22. 22.26 × 15 =
23. 23.17 × 15 =
24. 24.16 × 12 =
25. 25.21 × 24 =
26. 26.25 × 14 =
27. 27.40 × 18 =
28. 28.38 × 12 =
29. 29.17 × 16 =
30. 30.19 × 18 =
31. 31.16 × 14 =
32. 32.44 × 15 =
33. 33.45 × 18 =
34. 34.11 × 12 =
35. 35.21 × 15 =
36. 36.49 × 16 =
37. 37.16 × 16 =
38. 38.37 × 16 =
39. 39.33 × 24 =
40. 40.12 × 18 =

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