Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 14 · 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. 1.17 × 18 =
2. 2.23 × 12 =
3. 3.22 × 12 =
4. 4.46 × 12 =
5. 5.19 × 12 =
6. 6.47 × 14 =
7. 7.39 × 15 =
8. 8.21 × 12 =
9. 9.49 × 18 =
10. 10.12 × 12 =
11. 11.36 × 24 =
12. 12.46 × 24 =
13. 13.16 × 24 =
14. 14.30 × 12 =
15. 15.29 × 24 =
16. 16.19 × 14 =
17. 17.16 × 15 =
18. 18.36 × 14 =
19. 19.12 × 24 =
20. 20.45 × 15 =
21. 21.46 × 15 =
22. 22.43 × 18 =
23. 23.27 × 15 =
24. 24.23 × 24 =
25. 25.31 × 15 =
26. 26.46 × 18 =
27. 27.30 × 16 =
28. 28.14 × 16 =
29. 29.17 × 12 =
30. 30.45 × 16 =
31. 31.29 × 12 =
32. 32.13 × 18 =
33. 33.13 × 12 =
34. 34.22 × 18 =
35. 35.33 × 24 =
36. 36.30 × 14 =
37. 37.21 × 18 =
38. 38.17 × 16 =
39. 39.31 × 18 =
40. 40.11 × 24 =

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