Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 691 · 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 × 24 =
2. 2.13 × 15 =
3. 3.42 × 12 =
4. 4.21 × 16 =
5. 5.48 × 12 =
6. 6.14 × 14 =
7. 7.17 × 15 =
8. 8.43 × 24 =
9. 9.18 × 14 =
10. 10.35 × 18 =
11. 11.11 × 12 =
12. 12.44 × 18 =
13. 13.48 × 15 =
14. 14.20 × 16 =
15. 15.40 × 14 =
16. 16.15 × 14 =
17. 17.30 × 15 =
18. 18.46 × 12 =
19. 19.17 × 24 =
20. 20.38 × 14 =
21. 21.14 × 24 =
22. 22.18 × 15 =
23. 23.12 × 24 =
24. 24.31 × 14 =
25. 25.45 × 16 =
26. 26.29 × 14 =
27. 27.41 × 14 =
28. 28.38 × 18 =
29. 29.25 × 15 =
30. 30.14 × 18 =
31. 31.25 × 12 =
32. 32.15 × 18 =
33. 33.46 × 18 =
34. 34.48 × 18 =
35. 35.25 × 18 =
36. 36.39 × 24 =
37. 37.39 × 12 =
38. 38.23 × 15 =
39. 39.16 × 15 =
40. 40.26 × 24 =

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