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By rounding each term to a whole number, estimate seven and two-thirds plus four and one twelfth.
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Here’s what we’re trying to estimate.
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Before we can estimate, we need to take each of these add-ins and round them to their nearest whole number.
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Let’s start with seven and two-thirds.
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When rounding to the nearest whole number, the seven will either stay the same or go up to eight.
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Seven and two-thirds is slightly closer to eight on a number line than it is to seven.
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This means that seven and two-thirds rounded to the nearest whole number is eight.
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We need to follow the same process for four and one twelfth.
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We’ll either round it to four or five.
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Four and one twelfth falls closer to the four than to the five on a number line, which means that four and one twelfth rounds to the nearest whole number as four.
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Now we can estimate the addition problem.
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Eight plus four equals twelve.
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Seven and two-thirds plus four and one twelfth is about twelve.