Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 232 · 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 × 18 =
2. 2.33 × 15 =
3. 3.38 × 18 =
4. 4.20 × 15 =
5. 5.18 × 12 =
6. 6.29 × 18 =
7. 7.32 × 16 =
8. 8.37 × 24 =
9. 9.47 × 16 =
10. 10.14 × 12 =
11. 11.36 × 24 =
12. 12.18 × 15 =
13. 13.34 × 24 =
14. 14.25 × 14 =
15. 15.39 × 15 =
16. 16.36 × 18 =
17. 17.23 × 12 =
18. 18.15 × 16 =
19. 19.12 × 18 =
20. 20.48 × 18 =
21. 21.21 × 24 =
22. 22.43 × 12 =
23. 23.37 × 12 =
24. 24.36 × 12 =
25. 25.17 × 16 =
26. 26.47 × 12 =
27. 27.25 × 15 =
28. 28.12 × 15 =
29. 29.17 × 14 =
30. 30.25 × 24 =
31. 31.30 × 12 =
32. 32.47 × 24 =
33. 33.22 × 12 =
34. 34.43 × 24 =
35. 35.39 × 24 =
36. 36.17 × 24 =
37. 37.30 × 14 =
38. 38.28 × 15 =
39. 39.19 × 18 =
40. 40.42 × 16 =

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