Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 152 · 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. 1.20 × 15 =
2. 2.48 × 24 =
3. 3.30 × 12 =
4. 4.13 × 18 =
5. 5.48 × 16 =
6. 6.38 × 18 =
7. 7.13 × 12 =
8. 8.25 × 12 =
9. 9.21 × 24 =
10. 10.31 × 12 =
11. 11.14 × 15 =
12. 12.16 × 16 =
13. 13.37 × 15 =
14. 14.34 × 16 =
15. 15.28 × 18 =
16. 16.22 × 24 =
17. 17.39 × 18 =
18. 18.40 × 14 =
19. 19.25 × 16 =
20. 20.34 × 12 =
21. 21.16 × 24 =
22. 22.40 × 16 =
23. 23.28 × 12 =
24. 24.15 × 15 =
25. 25.38 × 24 =
26. 26.21 × 12 =
27. 27.39 × 14 =
28. 28.25 × 15 =
29. 29.41 × 18 =
30. 30.26 × 16 =
31. 31.42 × 24 =
32. 32.30 × 16 =
33. 33.48 × 14 =
34. 34.20 × 14 =
35. 35.45 × 12 =
36. 36.42 × 15 =
37. 37.32 × 24 =
38. 38.17 × 24 =
39. 39.29 × 15 =
40. 40.18 × 14 =

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