Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 610 · 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. 1.36 × 16 =
2. 2.25 × 18 =
3. 3.49 × 24 =
4. 4.47 × 15 =
5. 5.32 × 12 =
6. 6.39 × 15 =
7. 7.23 × 15 =
8. 8.18 × 15 =
9. 9.38 × 15 =
10. 10.21 × 14 =
11. 11.22 × 14 =
12. 12.21 × 12 =
13. 13.23 × 16 =
14. 14.49 × 15 =
15. 15.14 × 24 =
16. 16.17 × 12 =
17. 17.41 × 14 =
18. 18.28 × 15 =
19. 19.48 × 18 =
20. 20.22 × 12 =
21. 21.38 × 14 =
22. 22.14 × 18 =
23. 23.33 × 12 =
24. 24.37 × 16 =
25. 25.15 × 18 =
26. 26.20 × 16 =
27. 27.12 × 16 =
28. 28.17 × 16 =
29. 29.22 × 15 =
30. 30.12 × 12 =
31. 31.21 × 16 =
32. 32.40 × 15 =
33. 33.14 × 16 =
34. 34.26 × 12 =
35. 35.17 × 18 =
36. 36.31 × 18 =
37. 37.12 × 18 =
38. 38.43 × 24 =
39. 39.19 × 14 =
40. 40.19 × 15 =

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