Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 846 · 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. 1.30 × 24 =
2. 2.18 × 15 =
3. 3.45 × 12 =
4. 4.12 × 24 =
5. 5.41 × 18 =
6. 6.19 × 24 =
7. 7.29 × 14 =
8. 8.17 × 14 =
9. 9.15 × 14 =
10. 10.18 × 18 =
11. 11.24 × 18 =
12. 12.13 × 14 =
13. 13.27 × 12 =
14. 14.33 × 12 =
15. 15.46 × 12 =
16. 16.21 × 18 =
17. 17.28 × 14 =
18. 18.30 × 15 =
19. 19.15 × 16 =
20. 20.17 × 24 =
21. 21.38 × 24 =
22. 22.45 × 15 =
23. 23.30 × 18 =
24. 24.46 × 14 =
25. 25.37 × 14 =
26. 26.31 × 18 =
27. 27.16 × 15 =
28. 28.40 × 16 =
29. 29.42 × 18 =
30. 30.24 × 15 =
31. 31.30 × 16 =
32. 32.36 × 15 =
33. 33.30 × 14 =
34. 34.21 × 14 =
35. 35.25 × 15 =
36. 36.20 × 24 =
37. 37.24 × 24 =
38. 38.22 × 14 =
39. 39.11 × 14 =
40. 40.28 × 15 =

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