Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 167 · 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. 1.30 × 15 =
2. 2.32 × 15 =
3. 3.14 × 14 =
4. 4.47 × 16 =
5. 5.46 × 15 =
6. 6.26 × 12 =
7. 7.31 × 24 =
8. 8.13 × 18 =
9. 9.36 × 15 =
10. 10.24 × 24 =
11. 11.42 × 12 =
12. 12.33 × 18 =
13. 13.45 × 15 =
14. 14.13 × 14 =
15. 15.32 × 14 =
16. 16.34 × 18 =
17. 17.24 × 12 =
18. 18.28 × 15 =
19. 19.36 × 14 =
20. 20.12 × 12 =
21. 21.31 × 16 =
22. 22.11 × 15 =
23. 23.34 × 15 =
24. 24.14 × 12 =
25. 25.15 × 24 =
26. 26.37 × 14 =
27. 27.28 × 14 =
28. 28.48 × 24 =
29. 29.37 × 12 =
30. 30.19 × 14 =
31. 31.16 × 14 =
32. 32.23 × 12 =
33. 33.26 × 16 =
34. 34.31 × 15 =
35. 35.49 × 24 =
36. 36.25 × 14 =
37. 37.17 × 18 =
38. 38.34 × 24 =
39. 39.47 × 12 =
40. 40.33 × 14 =

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