Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 120 · 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. 1.40 × 16 =
2. 2.28 × 16 =
3. 3.49 × 24 =
4. 4.15 × 15 =
5. 5.45 × 18 =
6. 6.34 × 14 =
7. 7.32 × 12 =
8. 8.40 × 14 =
9. 9.43 × 15 =
10. 10.20 × 12 =
11. 11.16 × 18 =
12. 12.18 × 14 =
13. 13.18 × 12 =
14. 14.30 × 18 =
15. 15.34 × 16 =
16. 16.26 × 16 =
17. 17.18 × 18 =
18. 18.39 × 18 =
19. 19.35 × 24 =
20. 20.40 × 15 =
21. 21.37 × 15 =
22. 22.41 × 16 =
23. 23.12 × 12 =
24. 24.44 × 14 =
25. 25.41 × 14 =
26. 26.34 × 18 =
27. 27.26 × 12 =
28. 28.30 × 12 =
29. 29.17 × 18 =
30. 30.19 × 12 =
31. 31.16 × 14 =
32. 32.34 × 12 =
33. 33.44 × 12 =
34. 34.22 × 16 =
35. 35.47 × 18 =
36. 36.13 × 14 =
37. 37.21 × 15 =
38. 38.14 × 18 =
39. 39.43 × 14 =
40. 40.19 × 15 =

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