Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 494 · 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. 1.19 × 24 =
2. 2.47 × 14 =
3. 3.26 × 24 =
4. 4.48 × 14 =
5. 5.16 × 12 =
6. 6.28 × 14 =
7. 7.42 × 24 =
8. 8.42 × 12 =
9. 9.17 × 14 =
10. 10.28 × 18 =
11. 11.38 × 15 =
12. 12.25 × 18 =
13. 13.37 × 14 =
14. 14.29 × 12 =
15. 15.17 × 16 =
16. 16.20 × 12 =
17. 17.26 × 14 =
18. 18.14 × 18 =
19. 19.34 × 14 =
20. 20.12 × 15 =
21. 21.38 × 18 =
22. 22.21 × 14 =
23. 23.35 × 18 =
24. 24.32 × 16 =
25. 25.16 × 16 =
26. 26.28 × 12 =
27. 27.30 × 15 =
28. 28.17 × 15 =
29. 29.42 × 18 =
30. 30.31 × 18 =
31. 31.22 × 14 =
32. 32.39 × 12 =
33. 33.35 × 12 =
34. 34.26 × 12 =
35. 35.39 × 15 =
36. 36.37 × 12 =
37. 37.46 × 15 =
38. 38.16 × 18 =
39. 39.31 × 12 =
40. 40.19 × 18 =

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