Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 398 · 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. 1.49 × 16 =
2. 2.45 × 24 =
3. 3.15 × 14 =
4. 4.37 × 12 =
5. 5.43 × 15 =
6. 6.25 × 24 =
7. 7.40 × 16 =
8. 8.14 × 14 =
9. 9.11 × 14 =
10. 10.36 × 14 =
11. 11.13 × 12 =
12. 12.33 × 14 =
13. 13.37 × 14 =
14. 14.34 × 24 =
15. 15.18 × 12 =
16. 16.35 × 24 =
17. 17.25 × 15 =
18. 18.14 × 15 =
19. 19.28 × 15 =
20. 20.41 × 12 =
21. 21.28 × 24 =
22. 22.27 × 15 =
23. 23.16 × 16 =
24. 24.20 × 12 =
25. 25.21 × 12 =
26. 26.38 × 18 =
27. 27.39 × 16 =
28. 28.17 × 16 =
29. 29.19 × 24 =
30. 30.12 × 12 =
31. 31.40 × 12 =
32. 32.43 × 18 =
33. 33.42 × 15 =
34. 34.38 × 16 =
35. 35.28 × 12 =
36. 36.49 × 15 =
37. 37.20 × 18 =
38. 38.27 × 12 =
39. 39.45 × 14 =
40. 40.31 × 16 =

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