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Natalie has 25.9 metres of cloth.
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If she wants to make shirts and each one needs 1.95 metres, about how many shirts can she make?
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We know that Natalie has 25.9 metres of cloth.
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And for every shirt, she will need 1.95 metres.
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So to calculate how many shirts she could make, we would have to divide 25.9 by 1.95.
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But there’s a very important word in the question.
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We’re not asked to find the exact amount of shirts that Natalie could make.
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We’re asked “about” how many shirts can she make.
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This tells us that we need to estimate the answer.
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To help us estimate, the first thing we need to do is round 25.9 to the nearest whole number.
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25.9 is between the numbers 25 and 26.
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And we can see from our number line that the nearest whole number is 26.
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1.95 is between one and two on the number line.
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And we can see the nearest whole number is number two.
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So 1.95 rounded to the nearest whole number is two.
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Now we have an easier calculation to work with.
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26 metres divided by two metres.
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Dividing by two is the same as halfing a number.
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Half of 26 is 13.
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If Natalie has 25.9 metres of cloth and each shirt needs 1.95 metres, she will be able to make about 13 shirts.
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We rounded 25.9 to 26, and we rounded 1.95 to two.
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And 26 divided by two equals 13.
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Natalie can make about 13 shirts.