Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 320 · 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. 1.19 × 18 =
2. 2.11 × 24 =
3. 3.28 × 15 =
4. 4.17 × 24 =
5. 5.14 × 15 =
6. 6.31 × 15 =
7. 7.18 × 15 =
8. 8.43 × 24 =
9. 9.34 × 12 =
10. 10.45 × 15 =
11. 11.35 × 14 =
12. 12.45 × 24 =
13. 13.20 × 14 =
14. 14.24 × 24 =
15. 15.48 × 24 =
16. 16.43 × 16 =
17. 17.42 × 16 =
18. 18.21 × 12 =
19. 19.17 × 14 =
20. 20.25 × 18 =
21. 21.47 × 15 =
22. 22.35 × 15 =
23. 23.16 × 15 =
24. 24.17 × 15 =
25. 25.12 × 14 =
26. 26.30 × 12 =
27. 27.18 × 12 =
28. 28.45 × 18 =
29. 29.26 × 15 =
30. 30.49 × 24 =
31. 31.15 × 24 =
32. 32.21 × 24 =
33. 33.23 × 24 =
34. 34.48 × 14 =
35. 35.28 × 12 =
36. 36.13 × 16 =
37. 37.23 × 14 =
38. 38.49 × 18 =
39. 39.16 × 14 =
40. 40.41 × 14 =

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