Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 630 · 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. 1.15 × 15 =
2. 2.21 × 12 =
3. 3.49 × 15 =
4. 4.12 × 14 =
5. 5.13 × 12 =
6. 6.49 × 24 =
7. 7.43 × 12 =
8. 8.22 × 16 =
9. 9.43 × 16 =
10. 10.22 × 15 =
11. 11.35 × 12 =
12. 12.21 × 16 =
13. 13.40 × 18 =
14. 14.36 × 24 =
15. 15.18 × 14 =
16. 16.12 × 24 =
17. 17.11 × 14 =
18. 18.21 × 18 =
19. 19.28 × 14 =
20. 20.42 × 18 =
21. 21.35 × 15 =
22. 22.35 × 14 =
23. 23.23 × 16 =
24. 24.14 × 12 =
25. 25.16 × 15 =
26. 26.47 × 12 =
27. 27.41 × 24 =
28. 28.44 × 14 =
29. 29.43 × 18 =
30. 30.16 × 16 =
31. 31.44 × 24 =
32. 32.34 × 12 =
33. 33.37 × 14 =
34. 34.19 × 14 =
35. 35.32 × 24 =
36. 36.12 × 16 =
37. 37.45 × 16 =
38. 38.11 × 18 =
39. 39.27 × 15 =
40. 40.49 × 16 =

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