Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 124 · 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. 1.19 × 16 =
2. 2.14 × 18 =
3. 3.14 × 12 =
4. 4.20 × 24 =
5. 5.44 × 15 =
6. 6.42 × 16 =
7. 7.27 × 15 =
8. 8.16 × 18 =
9. 9.21 × 12 =
10. 10.29 × 18 =
11. 11.22 × 15 =
12. 12.30 × 16 =
13. 13.35 × 24 =
14. 14.37 × 15 =
15. 15.32 × 16 =
16. 16.25 × 16 =
17. 17.49 × 24 =
18. 18.29 × 16 =
19. 19.27 × 12 =
20. 20.19 × 14 =
21. 21.14 × 16 =
22. 22.42 × 18 =
23. 23.15 × 16 =
24. 24.21 × 18 =
25. 25.33 × 15 =
26. 26.49 × 14 =
27. 27.16 × 15 =
28. 28.17 × 14 =
29. 29.35 × 18 =
30. 30.40 × 16 =
31. 31.27 × 16 =
32. 32.24 × 16 =
33. 33.23 × 24 =
34. 34.34 × 12 =
35. 35.22 × 12 =
36. 36.41 × 12 =
37. 37.17 × 12 =
38. 38.16 × 24 =
39. 39.46 × 18 =
40. 40.32 × 15 =

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