Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 881 · 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. 1.43 × 12 =
2. 2.18 × 16 =
3. 3.23 × 18 =
4. 4.33 × 15 =
5. 5.34 × 12 =
6. 6.18 × 15 =
7. 7.48 × 15 =
8. 8.43 × 15 =
9. 9.34 × 15 =
10. 10.44 × 12 =
11. 11.42 × 15 =
12. 12.16 × 18 =
13. 13.17 × 15 =
14. 14.28 × 14 =
15. 15.35 × 24 =
16. 16.19 × 16 =
17. 17.37 × 15 =
18. 18.13 × 15 =
19. 19.14 × 24 =
20. 20.19 × 14 =
21. 21.23 × 16 =
22. 22.18 × 14 =
23. 23.16 × 15 =
24. 24.45 × 12 =
25. 25.21 × 18 =
26. 26.44 × 18 =
27. 27.44 × 24 =
28. 28.22 × 18 =
29. 29.48 × 12 =
30. 30.43 × 16 =
31. 31.46 × 14 =
32. 32.23 × 15 =
33. 33.41 × 16 =
34. 34.44 × 16 =
35. 35.30 × 12 =
36. 36.21 × 14 =
37. 37.15 × 16 =
38. 38.15 × 24 =
39. 39.47 × 18 =
40. 40.20 × 12 =

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