Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 807 · 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. 1.38 × 18 =
2. 2.13 × 24 =
3. 3.30 × 12 =
4. 4.28 × 18 =
5. 5.12 × 24 =
6. 6.43 × 12 =
7. 7.23 × 15 =
8. 8.25 × 14 =
9. 9.44 × 18 =
10. 10.29 × 12 =
11. 11.18 × 12 =
12. 12.30 × 18 =
13. 13.27 × 16 =
14. 14.23 × 24 =
15. 15.48 × 18 =
16. 16.12 × 12 =
17. 17.42 × 14 =
18. 18.17 × 15 =
19. 19.14 × 12 =
20. 20.18 × 16 =
21. 21.46 × 18 =
22. 22.37 × 24 =
23. 23.20 × 14 =
24. 24.33 × 24 =
25. 25.45 × 15 =
26. 26.37 × 18 =
27. 27.27 × 24 =
28. 28.25 × 18 =
29. 29.26 × 24 =
30. 30.23 × 14 =
31. 31.18 × 15 =
32. 32.35 × 16 =
33. 33.22 × 18 =
34. 34.19 × 12 =
35. 35.26 × 15 =
36. 36.13 × 15 =
37. 37.48 × 14 =
38. 38.15 × 14 =
39. 39.38 × 12 =
40. 40.11 × 14 =

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