Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 404 · 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. 1.22 × 15 =
2. 2.23 × 16 =
3. 3.35 × 18 =
4. 4.21 × 12 =
5. 5.18 × 12 =
6. 6.27 × 16 =
7. 7.33 × 24 =
8. 8.14 × 14 =
9. 9.38 × 14 =
10. 10.47 × 16 =
11. 11.32 × 14 =
12. 12.28 × 15 =
13. 13.44 × 24 =
14. 14.28 × 18 =
15. 15.24 × 12 =
16. 16.29 × 18 =
17. 17.30 × 16 =
18. 18.22 × 12 =
19. 19.17 × 16 =
20. 20.30 × 18 =
21. 21.29 × 15 =
22. 22.26 × 16 =
23. 23.17 × 18 =
24. 24.37 × 15 =
25. 25.46 × 18 =
26. 26.45 × 14 =
27. 27.11 × 14 =
28. 28.11 × 24 =
29. 29.36 × 12 =
30. 30.16 × 18 =
31. 31.42 × 16 =
32. 32.17 × 15 =
33. 33.13 × 14 =
34. 34.41 × 14 =
35. 35.37 × 16 =
36. 36.25 × 18 =
37. 37.25 × 15 =
38. 38.26 × 18 =
39. 39.32 × 15 =
40. 40.49 × 14 =

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