Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 1 · 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. 1.13 × 12 =
2. 2.12 × 18 =
3. 3.27 × 15 =
4. 4.11 × 15 =
5. 5.12 × 24 =
6. 6.45 × 18 =
7. 7.16 × 16 =
8. 8.14 × 16 =
9. 9.37 × 15 =
10. 10.47 × 24 =
11. 11.45 × 14 =
12. 12.16 × 15 =
13. 13.19 × 18 =
14. 14.22 × 14 =
15. 15.23 × 16 =
16. 16.24 × 18 =
17. 17.15 × 18 =
18. 18.36 × 16 =
19. 19.13 × 14 =
20. 20.37 × 14 =
21. 21.37 × 12 =
22. 22.18 × 16 =
23. 23.11 × 12 =
24. 24.45 × 15 =
25. 25.32 × 24 =
26. 26.43 × 16 =
27. 27.15 × 14 =
28. 28.28 × 24 =
29. 29.34 × 12 =
30. 30.14 × 15 =
31. 31.18 × 15 =
32. 32.30 × 24 =
33. 33.29 × 24 =
34. 34.18 × 24 =
35. 35.23 × 15 =
36. 36.48 × 12 =
37. 37.41 × 15 =
38. 38.19 × 14 =
39. 39.48 × 14 =
40. 40.40 × 18 =

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