Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 764 · 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 × 15 =
2. 2.14 × 18 =
3. 3.15 × 16 =
4. 4.17 × 18 =
5. 5.28 × 12 =
6. 6.18 × 24 =
7. 7.23 × 18 =
8. 8.48 × 18 =
9. 9.36 × 14 =
10. 10.24 × 15 =
11. 11.18 × 15 =
12. 12.24 × 12 =
13. 13.11 × 12 =
14. 14.28 × 15 =
15. 15.36 × 18 =
16. 16.47 × 12 =
17. 17.41 × 12 =
18. 18.44 × 12 =
19. 19.47 × 16 =
20. 20.44 × 18 =
21. 21.49 × 18 =
22. 22.30 × 16 =
23. 23.34 × 12 =
24. 24.14 × 15 =
25. 25.32 × 12 =
26. 26.48 × 16 =
27. 27.30 × 12 =
28. 28.42 × 16 =
29. 29.19 × 18 =
30. 30.13 × 18 =
31. 31.12 × 18 =
32. 32.14 × 12 =
33. 33.47 × 14 =
34. 34.40 × 12 =
35. 35.48 × 15 =
36. 36.34 × 24 =
37. 37.45 × 24 =
38. 38.48 × 12 =
39. 39.39 × 14 =
40. 40.36 × 12 =

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