Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 993 · 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. 1.36 × 15 =
2. 2.30 × 18 =
3. 3.11 × 15 =
4. 4.37 × 16 =
5. 5.18 × 18 =
6. 6.19 × 16 =
7. 7.18 × 12 =
8. 8.38 × 16 =
9. 9.17 × 15 =
10. 10.29 × 18 =
11. 11.42 × 15 =
12. 12.41 × 15 =
13. 13.16 × 15 =
14. 14.33 × 15 =
15. 15.38 × 15 =
16. 16.26 × 24 =
17. 17.42 × 14 =
18. 18.24 × 12 =
19. 19.15 × 12 =
20. 20.47 × 12 =
21. 21.30 × 15 =
22. 22.13 × 14 =
23. 23.47 × 16 =
24. 24.19 × 14 =
25. 25.41 × 12 =
26. 26.17 × 24 =
27. 27.44 × 24 =
28. 28.18 × 24 =
29. 29.34 × 24 =
30. 30.11 × 24 =
31. 31.21 × 24 =
32. 32.37 × 14 =
33. 33.44 × 12 =
34. 34.29 × 14 =
35. 35.11 × 14 =
36. 36.18 × 16 =
37. 37.46 × 16 =
38. 38.28 × 12 =
39. 39.49 × 16 =
40. 40.44 × 18 =

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