Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 602 · 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. 1.14 × 15 =
2. 2.20 × 24 =
3. 3.36 × 16 =
4. 4.27 × 14 =
5. 5.48 × 12 =
6. 6.11 × 14 =
7. 7.29 × 14 =
8. 8.45 × 14 =
9. 9.16 × 15 =
10. 10.16 × 14 =
11. 11.47 × 15 =
12. 12.49 × 12 =
13. 13.21 × 15 =
14. 14.45 × 12 =
15. 15.49 × 14 =
16. 16.16 × 24 =
17. 17.19 × 15 =
18. 18.13 × 24 =
19. 19.15 × 24 =
20. 20.39 × 14 =
21. 21.39 × 15 =
22. 22.37 × 18 =
23. 23.42 × 16 =
24. 24.24 × 24 =
25. 25.30 × 16 =
26. 26.29 × 24 =
27. 27.19 × 14 =
28. 28.16 × 12 =
29. 29.23 × 14 =
30. 30.31 × 24 =
31. 31.35 × 14 =
32. 32.45 × 24 =
33. 33.22 × 14 =
34. 34.14 × 14 =
35. 35.33 × 12 =
36. 36.24 × 14 =
37. 37.40 × 14 =
38. 38.13 × 14 =
39. 39.44 × 12 =
40. 40.21 × 18 =

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