Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 110 · 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. 2.14 × 12 =
3. 3.15 × 12 =
4. 4.31 × 16 =
5. 5.25 × 12 =
6. 6.12 × 24 =
7. 7.32 × 18 =
8. 8.12 × 15 =
9. 9.12 × 14 =
10. 10.34 × 15 =
11. 11.45 × 18 =
12. 12.17 × 24 =
13. 13.19 × 14 =
14. 14.43 × 12 =
15. 15.17 × 15 =
16. 16.29 × 24 =
17. 17.22 × 16 =
18. 18.15 × 14 =
19. 19.20 × 16 =
20. 20.13 × 14 =
21. 21.21 × 16 =
22. 22.42 × 15 =
23. 23.34 × 16 =
24. 24.38 × 16 =
25. 25.13 × 12 =
26. 26.45 × 15 =
27. 27.13 × 24 =
28. 28.44 × 16 =
29. 29.15 × 16 =
30. 30.18 × 16 =
31. 31.32 × 24 =
32. 32.27 × 24 =
33. 33.37 × 14 =
34. 34.25 × 14 =
35. 35.38 × 18 =
36. 36.48 × 12 =
37. 37.26 × 12 =
38. 38.38 × 24 =
39. 39.30 × 14 =
40. 40.18 × 15 =

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