Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 61 · 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. 1.17 × 24 =
2. 2.21 × 14 =
3. 3.44 × 16 =
4. 4.34 × 15 =
5. 5.41 × 18 =
6. 6.13 × 18 =
7. 7.21 × 16 =
8. 8.11 × 14 =
9. 9.17 × 15 =
10. 10.12 × 15 =
11. 11.32 × 18 =
12. 12.26 × 16 =
13. 13.45 × 14 =
14. 14.34 × 18 =
15. 15.33 × 14 =
16. 16.25 × 24 =
17. 17.42 × 14 =
18. 18.26 × 12 =
19. 19.11 × 18 =
20. 20.39 × 16 =
21. 21.30 × 18 =
22. 22.16 × 16 =
23. 23.25 × 18 =
24. 24.21 × 24 =
25. 25.27 × 12 =
26. 26.24 × 15 =
27. 27.35 × 18 =
28. 28.41 × 12 =
29. 29.44 × 12 =
30. 30.37 × 24 =
31. 31.17 × 12 =
32. 32.29 × 15 =
33. 33.37 × 16 =
34. 34.28 × 14 =
35. 35.39 × 12 =
36. 36.18 × 14 =
37. 37.40 × 15 =
38. 38.21 × 12 =
39. 39.31 × 12 =
40. 40.39 × 14 =

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