Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 448 · 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. 1.32 × 16 =
2. 2.35 × 24 =
3. 3.19 × 15 =
4. 4.28 × 18 =
5. 5.15 × 18 =
6. 6.31 × 15 =
7. 7.37 × 14 =
8. 8.23 × 18 =
9. 9.35 × 16 =
10. 10.36 × 12 =
11. 11.28 × 15 =
12. 12.18 × 14 =
13. 13.36 × 24 =
14. 14.36 × 15 =
15. 15.19 × 18 =
16. 16.26 × 12 =
17. 17.18 × 15 =
18. 18.12 × 14 =
19. 19.28 × 12 =
20. 20.12 × 16 =
21. 21.19 × 14 =
22. 22.23 × 24 =
23. 23.34 × 12 =
24. 24.46 × 14 =
25. 25.26 × 14 =
26. 26.38 × 16 =
27. 27.24 × 14 =
28. 28.26 × 16 =
29. 29.48 × 16 =
30. 30.34 × 15 =
31. 31.18 × 12 =
32. 32.42 × 15 =
33. 33.19 × 24 =
34. 34.13 × 16 =
35. 35.20 × 12 =
36. 36.21 × 15 =
37. 37.15 × 24 =
38. 38.35 × 18 =
39. 39.15 × 15 =
40. 40.48 × 24 =

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