Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 201 · 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. 1.15 × 14 =
2. 2.38 × 16 =
3. 3.12 × 14 =
4. 4.17 × 14 =
5. 5.23 × 15 =
6. 6.42 × 24 =
7. 7.30 × 12 =
8. 8.25 × 16 =
9. 9.32 × 24 =
10. 10.43 × 12 =
11. 11.27 × 16 =
12. 12.30 × 16 =
13. 13.28 × 12 =
14. 14.15 × 12 =
15. 15.19 × 18 =
16. 16.29 × 16 =
17. 17.38 × 24 =
18. 18.26 × 24 =
19. 19.21 × 16 =
20. 20.11 × 12 =
21. 21.39 × 24 =
22. 22.20 × 15 =
23. 23.33 × 12 =
24. 24.31 × 12 =
25. 25.13 × 16 =
26. 26.14 × 14 =
27. 27.13 × 24 =
28. 28.24 × 18 =
29. 29.17 × 18 =
30. 30.35 × 12 =
31. 31.34 × 14 =
32. 32.14 × 12 =
33. 33.39 × 15 =
34. 34.43 × 24 =
35. 35.40 × 24 =
36. 36.40 × 18 =
37. 37.18 × 16 =
38. 38.16 × 18 =
39. 39.45 × 15 =
40. 40.45 × 16 =

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