Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 53 · 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. 1.31 × 12 =
2. 2.36 × 15 =
3. 3.15 × 14 =
4. 4.23 × 12 =
5. 5.45 × 24 =
6. 6.38 × 16 =
7. 7.17 × 18 =
8. 8.17 × 14 =
9. 9.21 × 14 =
10. 10.48 × 24 =
11. 11.29 × 14 =
12. 12.12 × 15 =
13. 13.42 × 18 =
14. 14.33 × 12 =
15. 15.15 × 16 =
16. 16.34 × 16 =
17. 17.20 × 12 =
18. 18.41 × 16 =
19. 19.17 × 16 =
20. 20.45 × 14 =
21. 21.38 × 15 =
22. 22.11 × 12 =
23. 23.14 × 15 =
24. 24.21 × 24 =
25. 25.17 × 24 =
26. 26.33 × 14 =
27. 27.33 × 15 =
28. 28.45 × 18 =
29. 29.12 × 24 =
30. 30.24 × 18 =
31. 31.40 × 14 =
32. 32.38 × 14 =
33. 33.11 × 16 =
34. 34.31 × 16 =
35. 35.18 × 15 =
36. 36.19 × 14 =
37. 37.38 × 12 =
38. 38.48 × 18 =
39. 39.29 × 15 =
40. 40.34 × 12 =

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