Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 784 · 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. 1.16 × 18 =
2. 2.23 × 15 =
3. 3.35 × 16 =
4. 4.25 × 16 =
5. 5.14 × 14 =
6. 6.17 × 24 =
7. 7.20 × 24 =
8. 8.38 × 14 =
9. 9.21 × 18 =
10. 10.23 × 18 =
11. 11.48 × 15 =
12. 12.40 × 24 =
13. 13.41 × 15 =
14. 14.21 × 15 =
15. 15.26 × 15 =
16. 16.34 × 18 =
17. 17.13 × 24 =
18. 18.25 × 24 =
19. 19.14 × 15 =
20. 20.20 × 18 =
21. 21.22 × 16 =
22. 22.27 × 18 =
23. 23.43 × 12 =
24. 24.28 × 16 =
25. 25.12 × 18 =
26. 26.19 × 18 =
27. 27.32 × 18 =
28. 28.42 × 15 =
29. 29.12 × 12 =
30. 30.46 × 12 =
31. 31.32 × 12 =
32. 32.33 × 18 =
33. 33.43 × 24 =
34. 34.40 × 14 =
35. 35.33 × 24 =
36. 36.29 × 12 =
37. 37.20 × 14 =
38. 38.28 × 12 =
39. 39.16 × 24 =
40. 40.11 × 24 =

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