Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 644 · 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. 1.33 × 16 =
2. 2.40 × 15 =
3. 3.47 × 18 =
4. 4.34 × 14 =
5. 5.35 × 15 =
6. 6.49 × 16 =
7. 7.47 × 16 =
8. 8.34 × 24 =
9. 9.46 × 24 =
10. 10.47 × 12 =
11. 11.13 × 16 =
12. 12.12 × 12 =
13. 13.25 × 12 =
14. 14.31 × 24 =
15. 15.29 × 16 =
16. 16.21 × 15 =
17. 17.36 × 12 =
18. 18.27 × 18 =
19. 19.37 × 15 =
20. 20.38 × 18 =
21. 21.20 × 14 =
22. 22.16 × 14 =
23. 23.22 × 24 =
24. 24.37 × 16 =
25. 25.39 × 14 =
26. 26.25 × 15 =
27. 27.12 × 18 =
28. 28.14 × 24 =
29. 29.11 × 18 =
30. 30.16 × 12 =
31. 31.19 × 14 =
32. 32.15 × 24 =
33. 33.39 × 24 =
34. 34.25 × 18 =
35. 35.46 × 12 =
36. 36.43 × 24 =
37. 37.29 × 12 =
38. 38.27 × 15 =
39. 39.38 × 15 =
40. 40.35 × 24 =

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