Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 700 · 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. 1.13 × 24 =
2. 2.33 × 14 =
3. 3.33 × 24 =
4. 4.40 × 15 =
5. 5.48 × 18 =
6. 6.16 × 18 =
7. 7.42 × 16 =
8. 8.38 × 24 =
9. 9.23 × 16 =
10. 10.43 × 12 =
11. 11.17 × 14 =
12. 12.15 × 16 =
13. 13.17 × 16 =
14. 14.21 × 15 =
15. 15.27 × 14 =
16. 16.28 × 15 =
17. 17.11 × 16 =
18. 18.20 × 15 =
19. 19.41 × 24 =
20. 20.15 × 15 =
21. 21.39 × 12 =
22. 22.16 × 16 =
23. 23.19 × 15 =
24. 24.41 × 16 =
25. 25.12 × 16 =
26. 26.46 × 15 =
27. 27.43 × 15 =
28. 28.41 × 14 =
29. 29.32 × 24 =
30. 30.44 × 12 =
31. 31.21 × 18 =
32. 32.17 × 15 =
33. 33.47 × 16 =
34. 34.27 × 24 =
35. 35.12 × 18 =
36. 36.21 × 16 =
37. 37.15 × 14 =
38. 38.35 × 12 =
39. 39.37 × 16 =
40. 40.38 × 14 =

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