Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 847 · 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 × 24 =
2. 2.16 × 16 =
3. 3.37 × 15 =
4. 4.12 × 18 =
5. 5.42 × 12 =
6. 6.12 × 24 =
7. 7.44 × 18 =
8. 8.15 × 14 =
9. 9.17 × 14 =
10. 10.46 × 14 =
11. 11.23 × 24 =
12. 12.45 × 18 =
13. 13.28 × 14 =
14. 14.36 × 24 =
15. 15.40 × 15 =
16. 16.48 × 12 =
17. 17.25 × 12 =
18. 18.36 × 16 =
19. 19.47 × 15 =
20. 20.48 × 24 =
21. 21.13 × 18 =
22. 22.20 × 14 =
23. 23.47 × 18 =
24. 24.27 × 15 =
25. 25.29 × 14 =
26. 26.14 × 15 =
27. 27.20 × 15 =
28. 28.29 × 24 =
29. 29.41 × 24 =
30. 30.44 × 24 =
31. 31.41 × 15 =
32. 32.31 × 24 =
33. 33.36 × 12 =
34. 34.43 × 12 =
35. 35.42 × 15 =
36. 36.43 × 14 =
37. 37.22 × 16 =
38. 38.27 × 24 =
39. 39.30 × 14 =
40. 40.35 × 16 =

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