Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 921 · 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. 1.14 × 16 =
2. 2.21 × 15 =
3. 3.29 × 14 =
4. 4.41 × 18 =
5. 5.32 × 15 =
6. 6.27 × 18 =
7. 7.28 × 12 =
8. 8.49 × 24 =
9. 9.11 × 18 =
10. 10.19 × 24 =
11. 11.22 × 24 =
12. 12.28 × 24 =
13. 13.34 × 15 =
14. 14.42 × 16 =
15. 15.19 × 16 =
16. 16.44 × 12 =
17. 17.16 × 12 =
18. 18.46 × 12 =
19. 19.33 × 18 =
20. 20.21 × 12 =
21. 21.45 × 24 =
22. 22.42 × 14 =
23. 23.15 × 16 =
24. 24.15 × 12 =
25. 25.38 × 14 =
26. 26.22 × 12 =
27. 27.20 × 16 =
28. 28.47 × 16 =
29. 29.24 × 14 =
30. 30.12 × 24 =
31. 31.30 × 12 =
32. 32.39 × 18 =
33. 33.22 × 16 =
34. 34.49 × 12 =
35. 35.19 × 18 =
36. 36.18 × 14 =
37. 37.17 × 24 =
38. 38.27 × 16 =
39. 39.12 × 14 =
40. 40.42 × 15 =

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