Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 667 · 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. 1.13 × 12 =
2. 2.31 × 15 =
3. 3.21 × 16 =
4. 4.23 × 24 =
5. 5.28 × 12 =
6. 6.26 × 24 =
7. 7.49 × 16 =
8. 8.45 × 14 =
9. 9.30 × 16 =
10. 10.35 × 15 =
11. 11.11 × 18 =
12. 12.18 × 15 =
13. 13.22 × 18 =
14. 14.19 × 14 =
15. 15.18 × 14 =
16. 16.27 × 24 =
17. 17.39 × 14 =
18. 18.49 × 14 =
19. 19.28 × 15 =
20. 20.29 × 24 =
21. 21.25 × 12 =
22. 22.37 × 18 =
23. 23.21 × 24 =
24. 24.25 × 14 =
25. 25.27 × 18 =
26. 26.14 × 16 =
27. 27.26 × 14 =
28. 28.19 × 24 =
29. 29.48 × 14 =
30. 30.36 × 14 =
31. 31.11 × 12 =
32. 32.30 × 24 =
33. 33.16 × 18 =
34. 34.30 × 12 =
35. 35.14 × 15 =
36. 36.16 × 15 =
37. 37.26 × 18 =
38. 38.29 × 18 =
39. 39.27 × 12 =
40. 40.45 × 24 =

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