Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 835 · 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. 1.26 × 15 =
2. 2.33 × 16 =
3. 3.17 × 16 =
4. 4.48 × 12 =
5. 5.19 × 14 =
6. 6.48 × 18 =
7. 7.14 × 15 =
8. 8.21 × 16 =
9. 9.38 × 15 =
10. 10.27 × 12 =
11. 11.42 × 18 =
12. 12.26 × 18 =
13. 13.18 × 12 =
14. 14.42 × 24 =
15. 15.29 × 12 =
16. 16.18 × 18 =
17. 17.40 × 24 =
18. 18.21 × 15 =
19. 19.16 × 14 =
20. 20.20 × 12 =
21. 21.13 × 12 =
22. 22.45 × 15 =
23. 23.12 × 15 =
24. 24.44 × 15 =
25. 25.23 × 24 =
26. 26.48 × 24 =
27. 27.13 × 14 =
28. 28.23 × 14 =
29. 29.20 × 16 =
30. 30.31 × 12 =
31. 31.16 × 15 =
32. 32.30 × 18 =
33. 33.27 × 16 =
34. 34.12 × 14 =
35. 35.40 × 12 =
36. 36.18 × 14 =
37. 37.34 × 15 =
38. 38.20 × 14 =
39. 39.25 × 14 =
40. 40.28 × 16 =

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