Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 5 · 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 × 18 =
2. 2.29 × 24 =
3. 3.29 × 16 =
4. 4.36 × 12 =
5. 5.39 × 14 =
6. 6.12 × 12 =
7. 7.39 × 16 =
8. 8.37 × 14 =
9. 9.39 × 15 =
10. 10.37 × 12 =
11. 11.12 × 18 =
12. 12.22 × 12 =
13. 13.30 × 12 =
14. 14.18 × 16 =
15. 15.22 × 14 =
16. 16.15 × 14 =
17. 17.11 × 12 =
18. 18.41 × 16 =
19. 19.45 × 12 =
20. 20.17 × 24 =
21. 21.48 × 24 =
22. 22.35 × 16 =
23. 23.35 × 12 =
24. 24.12 × 15 =
25. 25.34 × 16 =
26. 26.47 × 14 =
27. 27.35 × 24 =
28. 28.24 × 14 =
29. 29.14 × 16 =
30. 30.28 × 12 =
31. 31.25 × 15 =
32. 32.32 × 12 =
33. 33.30 × 16 =
34. 34.15 × 15 =
35. 35.28 × 16 =
36. 36.34 × 14 =
37. 37.22 × 16 =
38. 38.27 × 24 =
39. 39.30 × 14 =
40. 40.40 × 14 =

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