Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 763 · 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. 1.20 × 16 =
2. 2.41 × 14 =
3. 3.25 × 14 =
4. 4.23 × 14 =
5. 5.40 × 14 =
6. 6.43 × 16 =
7. 7.14 × 18 =
8. 8.37 × 14 =
9. 9.43 × 18 =
10. 10.43 × 24 =
11. 11.47 × 14 =
12. 12.34 × 18 =
13. 13.41 × 16 =
14. 14.19 × 16 =
15. 15.11 × 16 =
16. 16.44 × 16 =
17. 17.34 × 12 =
18. 18.39 × 12 =
19. 19.26 × 16 =
20. 20.29 × 15 =
21. 21.45 × 16 =
22. 22.16 × 14 =
23. 23.17 × 16 =
24. 24.45 × 18 =
25. 25.20 × 18 =
26. 26.38 × 12 =
27. 27.21 × 16 =
28. 28.16 × 12 =
29. 29.49 × 14 =
30. 30.22 × 24 =
31. 31.35 × 24 =
32. 32.35 × 14 =
33. 33.39 × 24 =
34. 34.21 × 15 =
35. 35.28 × 12 =
36. 36.43 × 14 =
37. 37.20 × 12 =
38. 38.44 × 24 =
39. 39.39 × 15 =
40. 40.23 × 24 =

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