Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 886 · 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. 1.17 × 18 =
2. 2.23 × 16 =
3. 3.20 × 14 =
4. 4.36 × 18 =
5. 5.47 × 14 =
6. 6.13 × 12 =
7. 7.17 × 15 =
8. 8.14 × 24 =
9. 9.38 × 18 =
10. 10.16 × 14 =
11. 11.29 × 12 =
12. 12.38 × 15 =
13. 13.49 × 18 =
14. 14.29 × 14 =
15. 15.24 × 18 =
16. 16.12 × 16 =
17. 17.49 × 24 =
18. 18.44 × 14 =
19. 19.36 × 12 =
20. 20.24 × 14 =
21. 21.49 × 12 =
22. 22.15 × 15 =
23. 23.25 × 16 =
24. 24.35 × 14 =
25. 25.48 × 15 =
26. 26.42 × 14 =
27. 27.43 × 14 =
28. 28.34 × 14 =
29. 29.44 × 15 =
30. 30.40 × 14 =
31. 31.18 × 12 =
32. 32.26 × 15 =
33. 33.13 × 16 =
34. 34.12 × 12 =
35. 35.33 × 16 =
36. 36.23 × 18 =
37. 37.39 × 24 =
38. 38.49 × 16 =
39. 39.47 × 24 =
40. 40.46 × 14 =

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