Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 787 · 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. 1.38 × 15 =
2. 2.42 × 14 =
3. 3.15 × 18 =
4. 4.15 × 14 =
5. 5.35 × 24 =
6. 6.23 × 16 =
7. 7.18 × 12 =
8. 8.47 × 14 =
9. 9.21 × 12 =
10. 10.28 × 16 =
11. 11.29 × 24 =
12. 12.21 × 18 =
13. 13.47 × 15 =
14. 14.20 × 16 =
15. 15.30 × 16 =
16. 16.40 × 18 =
17. 17.31 × 16 =
18. 18.25 × 14 =
19. 19.26 × 18 =
20. 20.41 × 14 =
21. 21.14 × 16 =
22. 22.28 × 24 =
23. 23.40 × 12 =
24. 24.47 × 16 =
25. 25.34 × 15 =
26. 26.14 × 12 =
27. 27.23 × 24 =
28. 28.46 × 24 =
29. 29.33 × 16 =
30. 30.15 × 15 =
31. 31.31 × 15 =
32. 32.17 × 12 =
33. 33.49 × 16 =
34. 34.42 × 18 =
35. 35.27 × 12 =
36. 36.21 × 16 =
37. 37.18 × 14 =
38. 38.46 × 14 =
39. 39.13 × 14 =
40. 40.41 × 18 =

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