Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 431 · 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. 1.21 × 16 =
2. 2.11 × 12 =
3. 3.46 × 14 =
4. 4.18 × 14 =
5. 5.11 × 14 =
6. 6.45 × 14 =
7. 7.38 × 15 =
8. 8.13 × 18 =
9. 9.31 × 24 =
10. 10.16 × 16 =
11. 11.47 × 14 =
12. 12.27 × 12 =
13. 13.17 × 12 =
14. 14.30 × 16 =
15. 15.19 × 15 =
16. 16.33 × 16 =
17. 17.18 × 24 =
18. 18.42 × 16 =
19. 19.33 × 14 =
20. 20.18 × 15 =
21. 21.17 × 15 =
22. 22.20 × 12 =
23. 23.12 × 18 =
24. 24.22 × 16 =
25. 25.31 × 12 =
26. 26.45 × 18 =
27. 27.15 × 18 =
28. 28.46 × 24 =
29. 29.34 × 14 =
30. 30.25 × 14 =
31. 31.27 × 14 =
32. 32.34 × 24 =
33. 33.19 × 16 =
34. 34.36 × 12 =
35. 35.42 × 12 =
36. 36.35 × 12 =
37. 37.33 × 15 =
38. 38.22 × 24 =
39. 39.21 × 15 =
40. 40.33 × 18 =

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