Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 952 · 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. 1.32 × 15 =
2. 2.12 × 16 =
3. 3.47 × 18 =
4. 4.43 × 15 =
5. 5.37 × 24 =
6. 6.25 × 14 =
7. 7.12 × 14 =
8. 8.21 × 24 =
9. 9.32 × 12 =
10. 10.23 × 12 =
11. 11.21 × 16 =
12. 12.17 × 14 =
13. 13.11 × 16 =
14. 14.49 × 16 =
15. 15.17 × 12 =
16. 16.26 × 12 =
17. 17.42 × 14 =
18. 18.47 × 24 =
19. 19.16 × 12 =
20. 20.38 × 16 =
21. 21.32 × 14 =
22. 22.44 × 18 =
23. 23.23 × 14 =
24. 24.13 × 14 =
25. 25.39 × 18 =
26. 26.34 × 14 =
27. 27.19 × 18 =
28. 28.30 × 18 =
29. 29.43 × 12 =
30. 30.30 × 16 =
31. 31.33 × 18 =
32. 32.23 × 15 =
33. 33.28 × 16 =
34. 34.20 × 18 =
35. 35.11 × 15 =
36. 36.28 × 14 =
37. 37.48 × 14 =
38. 38.32 × 24 =
39. 39.40 × 24 =
40. 40.35 × 14 =

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