Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 828 · 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. 1.45 × 14 =
2. 2.28 × 24 =
3. 3.47 × 14 =
4. 4.19 × 14 =
5. 5.20 × 14 =
6. 6.48 × 14 =
7. 7.25 × 18 =
8. 8.43 × 24 =
9. 9.15 × 18 =
10. 10.29 × 15 =
11. 11.26 × 12 =
12. 12.21 × 16 =
13. 13.22 × 14 =
14. 14.23 × 24 =
15. 15.25 × 15 =
16. 16.32 × 15 =
17. 17.13 × 15 =
18. 18.19 × 24 =
19. 19.11 × 14 =
20. 20.26 × 24 =
21. 21.40 × 14 =
22. 22.30 × 15 =
23. 23.30 × 12 =
24. 24.19 × 16 =
25. 25.24 × 14 =
26. 26.18 × 12 =
27. 27.26 × 16 =
28. 28.14 × 15 =
29. 29.35 × 16 =
30. 30.22 × 24 =
31. 31.20 × 24 =
32. 32.27 × 14 =
33. 33.33 × 14 =
34. 34.33 × 24 =
35. 35.25 × 12 =
36. 36.46 × 14 =
37. 37.21 × 14 =
38. 38.46 × 15 =
39. 39.23 × 14 =
40. 40.47 × 18 =

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