Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 271 · 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. 1.16 × 15 =
2. 2.18 × 16 =
3. 3.20 × 12 =
4. 4.21 × 24 =
5. 5.46 × 18 =
6. 6.19 × 18 =
7. 7.14 × 14 =
8. 8.23 × 18 =
9. 9.29 × 18 =
10. 10.30 × 18 =
11. 11.42 × 15 =
12. 12.23 × 24 =
13. 13.26 × 18 =
14. 14.32 × 14 =
15. 15.40 × 14 =
16. 16.38 × 14 =
17. 17.13 × 12 =
18. 18.37 × 16 =
19. 19.49 × 16 =
20. 20.41 × 24 =
21. 21.42 × 12 =
22. 22.35 × 24 =
23. 23.30 × 12 =
24. 24.15 × 14 =
25. 25.33 × 24 =
26. 26.45 × 16 =
27. 27.45 × 24 =
28. 28.44 × 24 =
29. 29.43 × 12 =
30. 30.30 × 16 =
31. 31.12 × 16 =
32. 32.22 × 24 =
33. 33.22 × 12 =
34. 34.18 × 15 =
35. 35.49 × 15 =
36. 36.31 × 12 =
37. 37.26 × 15 =
38. 38.39 × 24 =
39. 39.28 × 15 =
40. 40.27 × 14 =

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