Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 19 · 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 × 24 =
2. 2.45 × 12 =
3. 3.17 × 14 =
4. 4.20 × 18 =
5. 5.27 × 14 =
6. 6.39 × 14 =
7. 7.28 × 16 =
8. 8.20 × 24 =
9. 9.32 × 14 =
10. 10.41 × 14 =
11. 11.15 × 15 =
12. 12.15 × 12 =
13. 13.18 × 14 =
14. 14.22 × 24 =
15. 15.30 × 24 =
16. 16.30 × 15 =
17. 17.29 × 12 =
18. 18.17 × 16 =
19. 19.25 × 18 =
20. 20.14 × 18 =
21. 21.13 × 14 =
22. 22.49 × 15 =
23. 23.12 × 14 =
24. 24.46 × 16 =
25. 25.48 × 18 =
26. 26.13 × 12 =
27. 27.34 × 14 =
28. 28.37 × 14 =
29. 29.40 × 18 =
30. 30.31 × 14 =
31. 31.16 × 14 =
32. 32.35 × 14 =
33. 33.40 × 24 =
34. 34.40 × 14 =
35. 35.14 × 14 =
36. 36.46 × 15 =
37. 37.47 × 15 =
38. 38.30 × 16 =
39. 39.13 × 18 =
40. 40.21 × 12 =

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