Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 627 · 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. 1.22 × 18 =
2. 2.39 × 14 =
3. 3.40 × 12 =
4. 4.49 × 24 =
5. 5.36 × 18 =
6. 6.14 × 16 =
7. 7.27 × 24 =
8. 8.45 × 12 =
9. 9.37 × 14 =
10. 10.15 × 12 =
11. 11.16 × 15 =
12. 12.34 × 24 =
13. 13.40 × 15 =
14. 14.13 × 12 =
15. 15.41 × 16 =
16. 16.17 × 15 =
17. 17.14 × 14 =
18. 18.11 × 15 =
19. 19.34 × 14 =
20. 20.25 × 18 =
21. 21.23 × 16 =
22. 22.14 × 18 =
23. 23.23 × 12 =
24. 24.31 × 16 =
25. 25.20 × 16 =
26. 26.11 × 12 =
27. 27.18 × 15 =
28. 28.21 × 16 =
29. 29.36 × 16 =
30. 30.25 × 24 =
31. 31.49 × 16 =
32. 32.16 × 24 =
33. 33.17 × 16 =
34. 34.32 × 12 =
35. 35.29 × 15 =
36. 36.40 × 24 =
37. 37.37 × 18 =
38. 38.28 × 18 =
39. 39.20 × 24 =
40. 40.35 × 18 =

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