Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 147 · 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. 1.36 × 24 =
2. 2.46 × 14 =
3. 3.21 × 15 =
4. 4.19 × 16 =
5. 5.20 × 14 =
6. 6.45 × 14 =
7. 7.23 × 15 =
8. 8.29 × 12 =
9. 9.27 × 14 =
10. 10.19 × 14 =
11. 11.42 × 16 =
12. 12.39 × 16 =
13. 13.21 × 16 =
14. 14.12 × 24 =
15. 15.21 × 24 =
16. 16.21 × 18 =
17. 17.27 × 12 =
18. 18.17 × 24 =
19. 19.45 × 16 =
20. 20.19 × 15 =
21. 21.44 × 24 =
22. 22.48 × 14 =
23. 23.34 × 16 =
24. 24.14 × 15 =
25. 25.19 × 18 =
26. 26.15 × 24 =
27. 27.23 × 18 =
28. 28.25 × 24 =
29. 29.37 × 18 =
30. 30.25 × 16 =
31. 31.22 × 24 =
32. 32.40 × 12 =
33. 33.38 × 18 =
34. 34.12 × 14 =
35. 35.34 × 12 =
36. 36.18 × 12 =
37. 37.46 × 15 =
38. 38.26 × 18 =
39. 39.45 × 24 =
40. 40.39 × 15 =

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