Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 968 · 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 × 14 =
2. 2.38 × 12 =
3. 3.24 × 12 =
4. 4.32 × 24 =
5. 5.47 × 18 =
6. 6.18 × 24 =
7. 7.18 × 12 =
8. 8.13 × 18 =
9. 9.40 × 12 =
10. 10.13 × 15 =
11. 11.17 × 24 =
12. 12.34 × 15 =
13. 13.12 × 24 =
14. 14.45 × 16 =
15. 15.46 × 14 =
16. 16.34 × 16 =
17. 17.27 × 18 =
18. 18.40 × 15 =
19. 19.42 × 15 =
20. 20.43 × 15 =
21. 21.18 × 18 =
22. 22.36 × 12 =
23. 23.15 × 18 =
24. 24.30 × 16 =
25. 25.26 × 14 =
26. 26.17 × 12 =
27. 27.15 × 16 =
28. 28.46 × 24 =
29. 29.49 × 12 =
30. 30.43 × 12 =
31. 31.38 × 24 =
32. 32.28 × 18 =
33. 33.35 × 16 =
34. 34.20 × 16 =
35. 35.21 × 18 =
36. 36.16 × 24 =
37. 37.49 × 15 =
38. 38.25 × 16 =
39. 39.11 × 15 =
40. 40.20 × 12 =

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