Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 468 · 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. 1.21 × 16 =
2. 2.18 × 14 =
3. 3.12 × 16 =
4. 4.17 × 15 =
5. 5.14 × 12 =
6. 6.30 × 24 =
7. 7.29 × 18 =
8. 8.28 × 16 =
9. 9.41 × 14 =
10. 10.44 × 12 =
11. 11.23 × 14 =
12. 12.28 × 12 =
13. 13.11 × 12 =
14. 14.19 × 14 =
15. 15.17 × 24 =
16. 16.27 × 12 =
17. 17.49 × 24 =
18. 18.41 × 18 =
19. 19.36 × 12 =
20. 20.12 × 18 =
21. 21.40 × 16 =
22. 22.19 × 12 =
23. 23.36 × 24 =
24. 24.49 × 12 =
25. 25.15 × 15 =
26. 26.11 × 14 =
27. 27.46 × 18 =
28. 28.26 × 15 =
29. 29.25 × 15 =
30. 30.28 × 14 =
31. 31.37 × 24 =
32. 32.32 × 12 =
33. 33.37 × 16 =
34. 34.22 × 16 =
35. 35.20 × 14 =
36. 36.25 × 24 =
37. 37.34 × 16 =
38. 38.30 × 16 =
39. 39.38 × 12 =
40. 40.25 × 16 =

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