Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 800 · 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. 1.23 × 24 =
2. 2.49 × 15 =
3. 3.14 × 18 =
4. 4.26 × 24 =
5. 5.48 × 16 =
6. 6.48 × 15 =
7. 7.28 × 24 =
8. 8.40 × 14 =
9. 9.34 × 18 =
10. 10.34 × 12 =
11. 11.32 × 24 =
12. 12.26 × 12 =
13. 13.25 × 24 =
14. 14.21 × 15 =
15. 15.36 × 24 =
16. 16.37 × 15 =
17. 17.41 × 12 =
18. 18.38 × 14 =
19. 19.34 × 14 =
20. 20.12 × 12 =
21. 21.41 × 16 =
22. 22.30 × 16 =
23. 23.47 × 12 =
24. 24.11 × 12 =
25. 25.19 × 12 =
26. 26.29 × 15 =
27. 27.11 × 24 =
28. 28.19 × 18 =
29. 29.34 × 15 =
30. 30.15 × 14 =
31. 31.31 × 24 =
32. 32.46 × 24 =
33. 33.19 × 15 =
34. 34.31 × 16 =
35. 35.26 × 15 =
36. 36.28 × 14 =
37. 37.43 × 12 =
38. 38.18 × 16 =
39. 39.38 × 16 =
40. 40.28 × 18 =

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