Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 498 · 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. 1.48 × 15 =
2. 2.19 × 24 =
3. 3.47 × 12 =
4. 4.15 × 15 =
5. 5.43 × 15 =
6. 6.18 × 12 =
7. 7.25 × 15 =
8. 8.31 × 16 =
9. 9.43 × 24 =
10. 10.25 × 18 =
11. 11.37 × 18 =
12. 12.48 × 14 =
13. 13.13 × 16 =
14. 14.27 × 24 =
15. 15.48 × 18 =
16. 16.37 × 12 =
17. 17.33 × 16 =
18. 18.16 × 12 =
19. 19.23 × 12 =
20. 20.35 × 14 =
21. 21.36 × 12 =
22. 22.38 × 24 =
23. 23.42 × 16 =
24. 24.31 × 15 =
25. 25.27 × 12 =
26. 26.15 × 24 =
27. 27.46 × 12 =
28. 28.25 × 16 =
29. 29.43 × 12 =
30. 30.14 × 12 =
31. 31.20 × 18 =
32. 32.17 × 12 =
33. 33.42 × 12 =
34. 34.48 × 12 =
35. 35.35 × 12 =
36. 36.13 × 24 =
37. 37.19 × 18 =
38. 38.12 × 15 =
39. 39.18 × 24 =
40. 40.15 × 14 =

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