Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 325 · 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. 1.21 × 15 =
2. 2.26 × 12 =
3. 3.30 × 15 =
4. 4.45 × 15 =
5. 5.36 × 15 =
6. 6.27 × 18 =
7. 7.27 × 14 =
8. 8.39 × 24 =
9. 9.44 × 18 =
10. 10.25 × 16 =
11. 11.29 × 14 =
12. 12.36 × 24 =
13. 13.15 × 15 =
14. 14.22 × 12 =
15. 15.23 × 15 =
16. 16.21 × 14 =
17. 17.45 × 24 =
18. 18.25 × 12 =
19. 19.28 × 16 =
20. 20.22 × 15 =
21. 21.37 × 18 =
22. 22.17 × 16 =
23. 23.49 × 16 =
24. 24.39 × 18 =
25. 25.17 × 14 =
26. 26.46 × 16 =
27. 27.19 × 15 =
28. 28.49 × 14 =
29. 29.28 × 12 =
30. 30.41 × 16 =
31. 31.38 × 16 =
32. 32.20 × 15 =
33. 33.28 × 24 =
34. 34.43 × 14 =
35. 35.47 × 16 =
36. 36.18 × 16 =
37. 37.40 × 18 =
38. 38.15 × 14 =
39. 39.24 × 16 =
40. 40.13 × 24 =

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