Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 605 · 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 × 16 =
2. 2.20 × 15 =
3. 3.13 × 24 =
4. 4.35 × 15 =
5. 5.29 × 24 =
6. 6.34 × 18 =
7. 7.22 × 14 =
8. 8.18 × 18 =
9. 9.15 × 15 =
10. 10.41 × 18 =
11. 11.47 × 12 =
12. 12.17 × 16 =
13. 13.11 × 12 =
14. 14.23 × 12 =
15. 15.48 × 14 =
16. 16.48 × 24 =
17. 17.14 × 14 =
18. 18.17 × 24 =
19. 19.32 × 12 =
20. 20.47 × 16 =
21. 21.28 × 15 =
22. 22.29 × 18 =
23. 23.26 × 24 =
24. 24.28 × 18 =
25. 25.36 × 12 =
26. 26.43 × 24 =
27. 27.35 × 12 =
28. 28.13 × 16 =
29. 29.18 × 14 =
30. 30.43 × 16 =
31. 31.13 × 18 =
32. 32.19 × 18 =
33. 33.36 × 18 =
34. 34.34 × 16 =
35. 35.24 × 14 =
36. 36.39 × 12 =
37. 37.38 × 16 =
38. 38.42 × 14 =
39. 39.11 × 15 =
40. 40.44 × 15 =

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