Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 482 · 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. 1.11 × 15 =
2. 2.15 × 15 =
3. 3.28 × 18 =
4. 4.20 × 24 =
5. 5.11 × 12 =
6. 6.16 × 18 =
7. 7.32 × 24 =
8. 8.31 × 15 =
9. 9.42 × 15 =
10. 10.21 × 18 =
11. 11.24 × 14 =
12. 12.18 × 14 =
13. 13.16 × 14 =
14. 14.30 × 14 =
15. 15.44 × 15 =
16. 16.29 × 15 =
17. 17.45 × 18 =
18. 18.16 × 16 =
19. 19.27 × 15 =
20. 20.45 × 16 =
21. 21.14 × 16 =
22. 22.28 × 14 =
23. 23.18 × 16 =
24. 24.27 × 14 =
25. 25.24 × 12 =
26. 26.27 × 16 =
27. 27.15 × 16 =
28. 28.31 × 16 =
29. 29.21 × 12 =
30. 30.41 × 14 =
31. 31.35 × 18 =
32. 32.40 × 24 =
33. 33.15 × 12 =
34. 34.22 × 15 =
35. 35.36 × 14 =
36. 36.46 × 12 =
37. 37.31 × 14 =
38. 38.17 × 15 =
39. 39.19 × 16 =
40. 40.26 × 15 =

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