Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 544 · 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. 2.19 × 18 =
3. 3.31 × 15 =
4. 4.17 × 12 =
5. 5.37 × 16 =
6. 6.40 × 16 =
7. 7.16 × 12 =
8. 8.49 × 24 =
9. 9.40 × 12 =
10. 10.33 × 14 =
11. 11.11 × 15 =
12. 12.12 × 24 =
13. 13.12 × 12 =
14. 14.26 × 12 =
15. 15.41 × 18 =
16. 16.30 × 15 =
17. 17.15 × 12 =
18. 18.11 × 14 =
19. 19.14 × 14 =
20. 20.49 × 14 =
21. 21.49 × 18 =
22. 22.22 × 24 =
23. 23.27 × 24 =
24. 24.23 × 14 =
25. 25.17 × 14 =
26. 26.48 × 12 =
27. 27.46 × 18 =
28. 28.41 × 14 =
29. 29.29 × 18 =
30. 30.28 × 12 =
31. 31.34 × 18 =
32. 32.46 × 15 =
33. 33.20 × 14 =
34. 34.25 × 15 =
35. 35.13 × 14 =
36. 36.43 × 14 =
37. 37.20 × 18 =
38. 38.42 × 14 =
39. 39.45 × 12 =
40. 40.35 × 24 =

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