Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 489 · 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. 1.15 × 14 =
2. 2.26 × 16 =
3. 3.16 × 15 =
4. 4.37 × 24 =
5. 5.17 × 15 =
6. 6.21 × 14 =
7. 7.33 × 12 =
8. 8.18 × 18 =
9. 9.19 × 24 =
10. 10.28 × 12 =
11. 11.20 × 18 =
12. 12.12 × 16 =
13. 13.43 × 16 =
14. 14.46 × 18 =
15. 15.29 × 14 =
16. 16.42 × 15 =
17. 17.35 × 18 =
18. 18.43 × 14 =
19. 19.25 × 12 =
20. 20.28 × 14 =
21. 21.26 × 12 =
22. 22.43 × 15 =
23. 23.24 × 15 =
24. 24.30 × 14 =
25. 25.29 × 18 =
26. 26.32 × 16 =
27. 27.48 × 15 =
28. 28.16 × 24 =
29. 29.11 × 15 =
30. 30.14 × 12 =
31. 31.39 × 12 =
32. 32.11 × 12 =
33. 33.35 × 12 =
34. 34.15 × 18 =
35. 35.26 × 15 =
36. 36.43 × 24 =
37. 37.43 × 12 =
38. 38.37 × 16 =
39. 39.38 × 16 =
40. 40.13 × 18 =

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