Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 774 · 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 × 15 =
2. 2.41 × 12 =
3. 3.27 × 14 =
4. 4.41 × 14 =
5. 5.16 × 14 =
6. 6.16 × 16 =
7. 7.37 × 15 =
8. 8.40 × 16 =
9. 9.46 × 18 =
10. 10.18 × 15 =
11. 11.19 × 14 =
12. 12.47 × 12 =
13. 13.32 × 15 =
14. 14.43 × 16 =
15. 15.41 × 18 =
16. 16.25 × 16 =
17. 17.22 × 14 =
18. 18.35 × 24 =
19. 19.30 × 24 =
20. 20.46 × 14 =
21. 21.12 × 16 =
22. 22.23 × 24 =
23. 23.29 × 14 =
24. 24.21 × 14 =
25. 25.46 × 12 =
26. 26.15 × 15 =
27. 27.30 × 14 =
28. 28.35 × 12 =
29. 29.36 × 18 =
30. 30.42 × 14 =
31. 31.16 × 15 =
32. 32.24 × 14 =
33. 33.24 × 24 =
34. 34.18 × 16 =
35. 35.27 × 16 =
36. 36.16 × 12 =
37. 37.24 × 16 =
38. 38.37 × 18 =
39. 39.15 × 18 =
40. 40.45 × 24 =

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