Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 112 · 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. 1.29 × 15 =
2. 2.25 × 18 =
3. 3.17 × 14 =
4. 4.21 × 16 =
5. 5.35 × 15 =
6. 6.40 × 18 =
7. 7.28 × 12 =
8. 8.18 × 15 =
9. 9.25 × 16 =
10. 10.24 × 12 =
11. 11.30 × 24 =
12. 12.15 × 15 =
13. 13.29 × 12 =
14. 14.46 × 16 =
15. 15.36 × 18 =
16. 16.15 × 24 =
17. 17.15 × 14 =
18. 18.20 × 18 =
19. 19.44 × 16 =
20. 20.30 × 12 =
21. 21.13 × 16 =
22. 22.28 × 15 =
23. 23.17 × 12 =
24. 24.46 × 12 =
25. 25.43 × 12 =
26. 26.20 × 14 =
27. 27.32 × 18 =
28. 28.16 × 18 =
29. 29.13 × 15 =
30. 30.21 × 18 =
31. 31.34 × 14 =
32. 32.32 × 16 =
33. 33.27 × 14 =
34. 34.25 × 14 =
35. 35.32 × 15 =
36. 36.41 × 14 =
37. 37.19 × 16 =
38. 38.27 × 15 =
39. 39.27 × 16 =
40. 40.18 × 18 =

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