Berenika wants to buy 35 t-shirts. Each t-shirt costs £5.80. Berenika does the calculation 40 x 6 = 240to estimate the costs of 35 t-shirts. Explain how Berenika's calculation shows that the actual cost will be less than £240

The calculation 40 * 6 is rounded to the nearest whole number.

Remember with a number 5 and higher, round up and a number 4 and below, round down.

35 → 40

5.80 → 6

The calculation will be less then £240 because both numbers were rounded up. We can check:

35 * 5.80 = £203

240 > 203

Therefore, the actual cost will lower because the number of t-shirts bought and the cost per t-shirt was rounded up.

1. 3.4/4

2. 0.8/7

3. 0.5 x 3

4. 0.9 x 6

5. 10.8

6. 2.35

7. 0.567

8. 9.35

9. 0.02

10. 0.06

11. 0.16

12. 0.42

13. 0.63

14. 5.6

15. 8.1

16. 9.9

17. 0.28

18. 0.48

19. 0.27

20. 0.49

21. 0.45

22. 0.72

23. 0.9

24. 0.88

25. 0.75

26. 0.16

27. 0.328

28. 0.495

29. 0.72

30. 1.068

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