Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 845 · 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. 1.17 × 14 =
2. 2.39 × 15 =
3. 3.16 × 12 =
4. 4.21 × 18 =
5. 5.35 × 12 =
6. 6.46 × 18 =
7. 7.16 × 14 =
8. 8.43 × 18 =
9. 9.40 × 12 =
10. 10.15 × 15 =
11. 11.29 × 18 =
12. 12.45 × 24 =
13. 13.29 × 15 =
14. 14.22 × 24 =
15. 15.42 × 14 =
16. 16.12 × 24 =
17. 17.14 × 24 =
18. 18.22 × 12 =
19. 19.28 × 15 =
20. 20.26 × 24 =
21. 21.16 × 24 =
22. 22.25 × 12 =
23. 23.45 × 12 =
24. 24.14 × 15 =
25. 25.44 × 15 =
26. 26.20 × 16 =
27. 27.21 × 24 =
28. 28.38 × 15 =
29. 29.39 × 16 =
30. 30.26 × 18 =
31. 31.34 × 12 =
32. 32.29 × 14 =
33. 33.39 × 12 =
34. 34.19 × 16 =
35. 35.29 × 24 =
36. 36.21 × 16 =
37. 37.31 × 14 =
38. 38.13 × 15 =
39. 39.25 × 24 =
40. 40.19 × 24 =

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