Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 740 · 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. 1.32 × 12 =
2. 2.25 × 14 =
3. 3.12 × 24 =
4. 4.34 × 12 =
5. 5.38 × 15 =
6. 6.18 × 16 =
7. 7.16 × 18 =
8. 8.11 × 12 =
9. 9.13 × 18 =
10. 10.39 × 24 =
11. 11.15 × 12 =
12. 12.33 × 16 =
13. 13.12 × 18 =
14. 14.35 × 18 =
15. 15.38 × 12 =
16. 16.33 × 14 =
17. 17.26 × 18 =
18. 18.23 × 24 =
19. 19.43 × 15 =
20. 20.36 × 15 =
21. 21.15 × 14 =
22. 22.41 × 24 =
23. 23.19 × 14 =
24. 24.21 × 24 =
25. 25.30 × 12 =
26. 26.20 × 15 =
27. 27.26 × 16 =
28. 28.24 × 18 =
29. 29.17 × 16 =
30. 30.14 × 16 =
31. 31.14 × 24 =
32. 32.24 × 24 =
33. 33.20 × 14 =
34. 34.27 × 15 =
35. 35.41 × 14 =
36. 36.33 × 18 =
37. 37.15 × 18 =
38. 38.34 × 14 =
39. 39.16 × 14 =
40. 40.26 × 24 =

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