Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 598 · 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. 1.25 × 15 =
2. 2.26 × 15 =
3. 3.26 × 24 =
4. 4.32 × 15 =
5. 5.46 × 18 =
6. 6.23 × 15 =
7. 7.17 × 16 =
8. 8.29 × 16 =
9. 9.35 × 12 =
10. 10.13 × 12 =
11. 11.14 × 12 =
12. 12.41 × 24 =
13. 13.45 × 12 =
14. 14.16 × 16 =
15. 15.21 × 18 =
16. 16.22 × 24 =
17. 17.39 × 24 =
18. 18.47 × 12 =
19. 19.38 × 16 =
20. 20.12 × 15 =
21. 21.15 × 12 =
22. 22.11 × 18 =
23. 23.23 × 16 =
24. 24.28 × 15 =
25. 25.45 × 16 =
26. 26.23 × 14 =
27. 27.13 × 24 =
28. 28.24 × 12 =
29. 29.19 × 18 =
30. 30.12 × 16 =
31. 31.27 × 16 =
32. 32.15 × 16 =
33. 33.14 × 18 =
34. 34.35 × 15 =
35. 35.15 × 18 =
36. 36.20 × 15 =
37. 37.15 × 24 =
38. 38.34 × 16 =
39. 39.22 × 16 =
40. 40.41 × 15 =

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