Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 286 · 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. 2.13 × 14 =
3. 3.25 × 16 =
4. 4.13 × 18 =
5. 5.31 × 24 =
6. 6.20 × 18 =
7. 7.40 × 14 =
8. 8.20 × 24 =
9. 9.27 × 14 =
10. 10.17 × 24 =
11. 11.30 × 18 =
12. 12.41 × 24 =
13. 13.27 × 12 =
14. 14.18 × 15 =
15. 15.47 × 14 =
16. 16.42 × 16 =
17. 17.41 × 16 =
18. 18.43 × 15 =
19. 19.37 × 16 =
20. 20.24 × 24 =
21. 21.19 × 24 =
22. 22.34 × 12 =
23. 23.35 × 14 =
24. 24.23 × 12 =
25. 25.12 × 14 =
26. 26.12 × 15 =
27. 27.46 × 12 =
28. 28.31 × 14 =
29. 29.45 × 18 =
30. 30.36 × 12 =
31. 31.36 × 15 =
32. 32.37 × 14 =
33. 33.27 × 16 =
34. 34.30 × 15 =
35. 35.28 × 24 =
36. 36.33 × 15 =
37. 37.22 × 24 =
38. 38.40 × 15 =
39. 39.29 × 24 =
40. 40.21 × 14 =

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