Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 622 · 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. 1.29 × 15 =
2. 2.29 × 12 =
3. 3.17 × 24 =
4. 4.45 × 12 =
5. 5.11 × 15 =
6. 6.37 × 16 =
7. 7.39 × 24 =
8. 8.46 × 14 =
9. 9.34 × 15 =
10. 10.20 × 16 =
11. 11.46 × 15 =
12. 12.33 × 18 =
13. 13.34 × 14 =
14. 14.46 × 24 =
15. 15.23 × 15 =
16. 16.30 × 24 =
17. 17.20 × 14 =
18. 18.35 × 14 =
19. 19.12 × 12 =
20. 20.11 × 12 =
21. 21.34 × 12 =
22. 22.15 × 15 =
23. 23.12 × 18 =
24. 24.11 × 24 =
25. 25.11 × 18 =
26. 26.41 × 15 =
27. 27.31 × 12 =
28. 28.29 × 18 =
29. 29.22 × 18 =
30. 30.34 × 16 =
31. 31.49 × 12 =
32. 32.43 × 24 =
33. 33.40 × 16 =
34. 34.31 × 16 =
35. 35.38 × 24 =
36. 36.43 × 18 =
37. 37.33 × 15 =
38. 38.37 × 18 =
39. 39.21 × 14 =
40. 40.18 × 24 =

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