Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 693 · 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. 1.29 × 24 =
2. 2.25 × 15 =
3. 3.49 × 14 =
4. 4.46 × 12 =
5. 5.39 × 18 =
6. 6.16 × 14 =
7. 7.11 × 24 =
8. 8.31 × 18 =
9. 9.25 × 18 =
10. 10.20 × 12 =
11. 11.49 × 16 =
12. 12.17 × 24 =
13. 13.40 × 18 =
14. 14.30 × 15 =
15. 15.18 × 12 =
16. 16.45 × 24 =
17. 17.11 × 14 =
18. 18.22 × 12 =
19. 19.14 × 12 =
20. 20.31 × 14 =
21. 21.16 × 15 =
22. 22.29 × 15 =
23. 23.45 × 12 =
24. 24.37 × 15 =
25. 25.35 × 14 =
26. 26.47 × 16 =
27. 27.24 × 16 =
28. 28.46 × 14 =
29. 29.12 × 15 =
30. 30.21 × 18 =
31. 31.35 × 18 =
32. 32.17 × 14 =
33. 33.17 × 15 =
34. 34.15 × 12 =
35. 35.15 × 18 =
36. 36.44 × 14 =
37. 37.28 × 15 =
38. 38.49 × 24 =
39. 39.14 × 16 =
40. 40.24 × 12 =

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