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17 July, 20:49

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

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  1. 18 July, 00:16
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    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.
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