Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 596 · 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. 1.35 × 15 =
2. 2.19 × 15 =
3. 3.12 × 14 =
4. 4.14 × 18 =
5. 5.26 × 15 =
6. 6.25 × 12 =
7. 7.21 × 18 =
8. 8.47 × 14 =
9. 9.21 × 15 =
10. 10.14 × 24 =
11. 11.44 × 12 =
12. 12.39 × 14 =
13. 13.18 × 15 =
14. 14.30 × 12 =
15. 15.32 × 18 =
16. 16.40 × 16 =
17. 17.38 × 14 =
18. 18.12 × 16 =
19. 19.37 × 15 =
20. 20.25 × 15 =
21. 21.17 × 12 =
22. 22.19 × 18 =
23. 23.43 × 18 =
24. 24.29 × 12 =
25. 25.37 × 24 =
26. 26.22 × 14 =
27. 27.49 × 24 =
28. 28.33 × 18 =
29. 29.23 × 16 =
30. 30.16 × 12 =
31. 31.12 × 18 =
32. 32.42 × 24 =
33. 33.17 × 18 =
34. 34.33 × 12 =
35. 35.26 × 14 =
36. 36.26 × 24 =
37. 37.18 × 24 =
38. 38.32 × 12 =
39. 39.21 × 14 =
40. 40.18 × 14 =

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