Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 454 · 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. 1.31 × 15 =
2. 2.12 × 14 =
3. 3.39 × 14 =
4. 4.19 × 24 =
5. 5.25 × 12 =
6. 6.13 × 24 =
7. 7.35 × 18 =
8. 8.28 × 12 =
9. 9.15 × 12 =
10. 10.15 × 14 =
11. 11.32 × 14 =
12. 12.41 × 16 =
13. 13.30 × 14 =
14. 14.26 × 15 =
15. 15.16 × 18 =
16. 16.15 × 15 =
17. 17.15 × 24 =
18. 18.38 × 12 =
19. 19.40 × 15 =
20. 20.48 × 12 =
21. 21.24 × 14 =
22. 22.18 × 16 =
23. 23.38 × 16 =
24. 24.43 × 18 =
25. 25.45 × 18 =
26. 26.20 × 18 =
27. 27.36 × 12 =
28. 28.49 × 24 =
29. 29.45 × 15 =
30. 30.47 × 16 =
31. 31.34 × 12 =
32. 32.36 × 15 =
33. 33.49 × 15 =
34. 34.16 × 16 =
35. 35.20 × 12 =
36. 36.23 × 24 =
37. 37.48 × 24 =
38. 38.19 × 18 =
39. 39.24 × 24 =
40. 40.13 × 14 =

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