Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 302 · 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. 2.12 × 15 =
3. 3.44 × 24 =
4. 4.15 × 18 =
5. 5.27 × 16 =
6. 6.12 × 14 =
7. 7.15 × 14 =
8. 8.16 × 24 =
9. 9.18 × 18 =
10. 10.32 × 18 =
11. 11.22 × 18 =
12. 12.20 × 14 =
13. 13.41 × 15 =
14. 14.16 × 12 =
15. 15.36 × 24 =
16. 16.45 × 15 =
17. 17.19 × 18 =
18. 18.34 × 14 =
19. 19.47 × 15 =
20. 20.37 × 12 =
21. 21.39 × 18 =
22. 22.11 × 18 =
23. 23.26 × 14 =
24. 24.28 × 24 =
25. 25.28 × 14 =
26. 26.30 × 12 =
27. 27.44 × 15 =
28. 28.25 × 12 =
29. 29.32 × 15 =
30. 30.45 × 12 =
31. 31.35 × 24 =
32. 32.13 × 12 =
33. 33.17 × 15 =
34. 34.47 × 14 =
35. 35.45 × 18 =
36. 36.22 × 14 =
37. 37.40 × 14 =
38. 38.26 × 18 =
39. 39.34 × 18 =
40. 40.48 × 24 =

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