Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 66 · 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. 1.37 × 12 =
2. 2.21 × 18 =
3. 3.15 × 24 =
4. 4.38 × 15 =
5. 5.41 × 12 =
6. 6.17 × 12 =
7. 7.14 × 12 =
8. 8.23 × 18 =
9. 9.26 × 24 =
10. 10.41 × 15 =
11. 11.28 × 24 =
12. 12.23 × 15 =
13. 13.26 × 16 =
14. 14.18 × 24 =
15. 15.43 × 14 =
16. 16.25 × 12 =
17. 17.37 × 24 =
18. 18.11 × 14 =
19. 19.34 × 12 =
20. 20.13 × 16 =
21. 21.28 × 14 =
22. 22.23 × 14 =
23. 23.24 × 16 =
24. 24.29 × 14 =
25. 25.15 × 14 =
26. 26.18 × 12 =
27. 27.49 × 12 =
28. 28.36 × 16 =
29. 29.38 × 24 =
30. 30.20 × 15 =
31. 31.35 × 12 =
32. 32.39 × 15 =
33. 33.32 × 16 =
34. 34.41 × 18 =
35. 35.13 × 18 =
36. 36.37 × 16 =
37. 37.41 × 24 =
38. 38.36 × 12 =
39. 39.43 × 18 =
40. 40.22 × 14 =

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