Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 340 · 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 × 15 =
2. 2.36 × 16 =
3. 3.23 × 24 =
4. 4.30 × 12 =
5. 5.25 × 16 =
6. 6.17 × 24 =
7. 7.42 × 14 =
8. 8.27 × 12 =
9. 9.17 × 16 =
10. 10.19 × 24 =
11. 11.39 × 24 =
12. 12.43 × 15 =
13. 13.13 × 14 =
14. 14.28 × 18 =
15. 15.12 × 12 =
16. 16.45 × 14 =
17. 17.37 × 18 =
18. 18.20 × 12 =
19. 19.13 × 16 =
20. 20.13 × 12 =
21. 21.23 × 14 =
22. 22.15 × 12 =
23. 23.16 × 15 =
24. 24.47 × 12 =
25. 25.42 × 24 =
26. 26.49 × 16 =
27. 27.34 × 12 =
28. 28.23 × 18 =
29. 29.31 × 15 =
30. 30.25 × 12 =
31. 31.46 × 12 =
32. 32.38 × 12 =
33. 33.40 × 15 =
34. 34.48 × 18 =
35. 35.29 × 12 =
36. 36.44 × 24 =
37. 37.29 × 16 =
38. 38.34 × 15 =
39. 39.14 × 14 =
40. 40.29 × 15 =

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