Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 640 · 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. 1.15 × 18 =
2. 2.29 × 24 =
3. 3.13 × 18 =
4. 4.25 × 18 =
5. 5.30 × 18 =
6. 6.44 × 15 =
7. 7.30 × 24 =
8. 8.16 × 14 =
9. 9.44 × 24 =
10. 10.43 × 16 =
11. 11.35 × 14 =
12. 12.37 × 18 =
13. 13.25 × 12 =
14. 14.21 × 15 =
15. 15.31 × 14 =
16. 16.32 × 12 =
17. 17.20 × 15 =
18. 18.33 × 14 =
19. 19.29 × 14 =
20. 20.11 × 24 =
21. 21.12 × 16 =
22. 22.19 × 12 =
23. 23.32 × 24 =
24. 24.38 × 16 =
25. 25.17 × 18 =
26. 26.28 × 16 =
27. 27.19 × 15 =
28. 28.17 × 14 =
29. 29.34 × 15 =
30. 30.24 × 24 =
31. 31.12 × 14 =
32. 32.25 × 15 =
33. 33.38 × 18 =
34. 34.13 × 15 =
35. 35.19 × 14 =
36. 36.23 × 12 =
37. 37.45 × 12 =
38. 38.34 × 24 =
39. 39.18 × 12 =
40. 40.40 × 16 =

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