Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 563 · 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. 1.12 × 18 =
2. 2.24 × 16 =
3. 3.23 × 12 =
4. 4.23 × 15 =
5. 5.17 × 24 =
6. 6.34 × 15 =
7. 7.21 × 15 =
8. 8.43 × 12 =
9. 9.45 × 24 =
10. 10.48 × 16 =
11. 11.25 × 16 =
12. 12.15 × 12 =
13. 13.24 × 14 =
14. 14.32 × 24 =
15. 15.17 × 12 =
16. 16.20 × 16 =
17. 17.42 × 18 =
18. 18.12 × 16 =
19. 19.31 × 12 =
20. 20.19 × 16 =
21. 21.37 × 18 =
22. 22.13 × 15 =
23. 23.42 × 12 =
24. 24.17 × 14 =
25. 25.39 × 15 =
26. 26.23 × 24 =
27. 27.19 × 12 =
28. 28.37 × 24 =
29. 29.24 × 15 =
30. 30.35 × 24 =
31. 31.30 × 16 =
32. 32.14 × 16 =
33. 33.33 × 16 =
34. 34.46 × 24 =
35. 35.34 × 24 =
36. 36.43 × 24 =
37. 37.38 × 12 =
38. 38.28 × 16 =
39. 39.18 × 14 =
40. 40.40 × 12 =

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