Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 173 · 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. 1.16 × 15 =
2. 2.17 × 12 =
3. 3.42 × 14 =
4. 4.15 × 18 =
5. 5.20 × 16 =
6. 6.11 × 14 =
7. 7.14 × 18 =
8. 8.35 × 12 =
9. 9.18 × 18 =
10. 10.42 × 24 =
11. 11.27 × 15 =
12. 12.13 × 15 =
13. 13.48 × 18 =
14. 14.33 × 18 =
15. 15.25 × 14 =
16. 16.40 × 12 =
17. 17.24 × 18 =
18. 18.17 × 18 =
19. 19.34 × 18 =
20. 20.37 × 12 =
21. 21.28 × 14 =
22. 22.34 × 24 =
23. 23.16 × 14 =
24. 24.18 × 24 =
25. 25.24 × 24 =
26. 26.32 × 16 =
27. 27.12 × 16 =
28. 28.36 × 18 =
29. 29.16 × 18 =
30. 30.34 × 16 =
31. 31.21 × 18 =
32. 32.29 × 16 =
33. 33.20 × 12 =
34. 34.37 × 18 =
35. 35.12 × 24 =
36. 36.41 × 24 =
37. 37.13 × 16 =
38. 38.33 × 15 =
39. 39.37 × 24 =
40. 40.29 × 15 =

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