Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 692 · 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. 1.24 × 12 =
2. 2.49 × 15 =
3. 3.46 × 12 =
4. 4.39 × 14 =
5. 5.17 × 15 =
6. 6.45 × 12 =
7. 7.48 × 24 =
8. 8.14 × 14 =
9. 9.20 × 16 =
10. 10.23 × 24 =
11. 11.28 × 16 =
12. 12.29 × 12 =
13. 13.43 × 15 =
14. 14.16 × 24 =
15. 15.18 × 16 =
16. 16.48 × 14 =
17. 17.44 × 15 =
18. 18.11 × 12 =
19. 19.21 × 14 =
20. 20.48 × 18 =
21. 21.49 × 18 =
22. 22.24 × 24 =
23. 23.46 × 14 =
24. 24.13 × 15 =
25. 25.29 × 24 =
26. 26.35 × 18 =
27. 27.30 × 24 =
28. 28.27 × 12 =
29. 29.13 × 24 =
30. 30.36 × 15 =
31. 31.19 × 16 =
32. 32.12 × 15 =
33. 33.49 × 14 =
34. 34.13 × 18 =
35. 35.20 × 15 =
36. 36.13 × 16 =
37. 37.11 × 18 =
38. 38.24 × 15 =
39. 39.30 × 15 =
40. 40.25 × 16 =

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