Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 616 · 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. 1.42 × 15 =
2. 2.11 × 14 =
3. 3.22 × 18 =
4. 4.45 × 24 =
5. 5.19 × 24 =
6. 6.27 × 16 =
7. 7.20 × 12 =
8. 8.30 × 15 =
9. 9.25 × 16 =
10. 10.39 × 12 =
11. 11.16 × 24 =
12. 12.16 × 16 =
13. 13.14 × 14 =
14. 14.29 × 16 =
15. 15.16 × 14 =
16. 16.39 × 24 =
17. 17.20 × 15 =
18. 18.29 × 14 =
19. 19.21 × 12 =
20. 20.23 × 16 =
21. 21.26 × 15 =
22. 22.36 × 14 =
23. 23.38 × 15 =
24. 24.18 × 12 =
25. 25.38 × 14 =
26. 26.29 × 15 =
27. 27.16 × 12 =
28. 28.19 × 12 =
29. 29.34 × 18 =
30. 30.13 × 18 =
31. 31.13 × 16 =
32. 32.29 × 18 =
33. 33.17 × 15 =
34. 34.11 × 12 =
35. 35.37 × 24 =
36. 36.16 × 15 =
37. 37.37 × 18 =
38. 38.18 × 18 =
39. 39.31 × 18 =
40. 40.11 × 15 =

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