Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 822 · 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. 1.15 × 12 =
2. 2.16 × 12 =
3. 3.17 × 24 =
4. 4.19 × 12 =
5. 5.23 × 14 =
6. 6.37 × 24 =
7. 7.31 × 16 =
8. 8.20 × 16 =
9. 9.21 × 15 =
10. 10.34 × 14 =
11. 11.49 × 14 =
12. 12.17 × 15 =
13. 13.45 × 16 =
14. 14.41 × 14 =
15. 15.46 × 24 =
16. 16.39 × 15 =
17. 17.49 × 16 =
18. 18.49 × 18 =
19. 19.13 × 15 =
20. 20.47 × 12 =
21. 21.19 × 18 =
22. 22.42 × 16 =
23. 23.21 × 24 =
24. 24.13 × 14 =
25. 25.27 × 12 =
26. 26.28 × 12 =
27. 27.47 × 14 =
28. 28.17 × 12 =
29. 29.26 × 24 =
30. 30.40 × 12 =
31. 31.36 × 16 =
32. 32.33 × 16 =
33. 33.25 × 15 =
34. 34.35 × 24 =
35. 35.38 × 18 =
36. 36.21 × 14 =
37. 37.43 × 15 =
38. 38.26 × 18 =
39. 39.13 × 18 =
40. 40.48 × 24 =

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