Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 573 · 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. 1.12 × 18 =
2. 2.25 × 18 =
3. 3.18 × 16 =
4. 4.14 × 12 =
5. 5.26 × 16 =
6. 6.39 × 12 =
7. 7.47 × 18 =
8. 8.23 × 12 =
9. 9.41 × 18 =
10. 10.15 × 14 =
11. 11.39 × 24 =
12. 12.26 × 12 =
13. 13.28 × 24 =
14. 14.42 × 16 =
15. 15.27 × 14 =
16. 16.34 × 24 =
17. 17.13 × 18 =
18. 18.38 × 16 =
19. 19.37 × 18 =
20. 20.41 × 24 =
21. 21.44 × 18 =
22. 22.34 × 16 =
23. 23.20 × 18 =
24. 24.16 × 15 =
25. 25.29 × 12 =
26. 26.47 × 12 =
27. 27.12 × 16 =
28. 28.17 × 15 =
29. 29.23 × 24 =
30. 30.15 × 15 =
31. 31.38 × 15 =
32. 32.24 × 14 =
33. 33.38 × 12 =
34. 34.24 × 24 =
35. 35.22 × 14 =
36. 36.45 × 24 =
37. 37.34 × 18 =
38. 38.23 × 14 =
39. 39.17 × 14 =
40. 40.39 × 14 =

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