Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 417 · 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. 1.31 × 14 =
2. 2.15 × 16 =
3. 3.46 × 16 =
4. 4.12 × 16 =
5. 5.16 × 12 =
6. 6.37 × 18 =
7. 7.33 × 14 =
8. 8.30 × 24 =
9. 9.24 × 18 =
10. 10.18 × 15 =
11. 11.17 × 15 =
12. 12.17 × 14 =
13. 13.39 × 16 =
14. 14.48 × 24 =
15. 15.37 × 16 =
16. 16.36 × 24 =
17. 17.12 × 24 =
18. 18.11 × 15 =
19. 19.14 × 14 =
20. 20.23 × 16 =
21. 21.44 × 14 =
22. 22.28 × 16 =
23. 23.45 × 12 =
24. 24.20 × 18 =
25. 25.13 × 12 =
26. 26.25 × 12 =
27. 27.12 × 12 =
28. 28.15 × 14 =
29. 29.11 × 24 =
30. 30.26 × 14 =
31. 31.24 × 24 =
32. 32.40 × 24 =
33. 33.15 × 15 =
34. 34.39 × 12 =
35. 35.17 × 24 =
36. 36.27 × 14 =
37. 37.42 × 14 =
38. 38.48 × 18 =
39. 39.28 × 14 =
40. 40.19 × 14 =

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