Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 737 · 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. 1.30 × 24 =
2. 2.39 × 14 =
3. 3.19 × 18 =
4. 4.27 × 24 =
5. 5.22 × 18 =
6. 6.44 × 16 =
7. 7.39 × 16 =
8. 8.24 × 15 =
9. 9.40 × 14 =
10. 10.36 × 14 =
11. 11.25 × 15 =
12. 12.27 × 14 =
13. 13.28 × 16 =
14. 14.23 × 24 =
15. 15.18 × 12 =
16. 16.30 × 15 =
17. 17.16 × 18 =
18. 18.22 × 14 =
19. 19.14 × 15 =
20. 20.41 × 15 =
21. 21.25 × 16 =
22. 22.20 × 15 =
23. 23.12 × 16 =
24. 24.32 × 15 =
25. 25.16 × 24 =
26. 26.16 × 14 =
27. 27.23 × 16 =
28. 28.32 × 14 =
29. 29.29 × 12 =
30. 30.23 × 15 =
31. 31.43 × 18 =
32. 32.26 × 15 =
33. 33.25 × 12 =
34. 34.43 × 14 =
35. 35.34 × 12 =
36. 36.36 × 15 =
37. 37.21 × 15 =
38. 38.45 × 12 =
39. 39.19 × 15 =
40. 40.48 × 24 =

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