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Estimation

Mathematics, Grade 4

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Study Guide Estimation Mathematics, Grade 4

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ESTIMATION To estimate means to make an educated guess based on what you already know. You can estimate an answer to an addition or subtraction problem by rounding the numbers in the problem before adding or subtracting. The estimated answer should be close to the final answer, but probably won’t be the exact final answer. Estimating saves time and steps and gives you an idea of what the final answer would be. Let’s Try It: Estimate the answer to the following addition problem: 486 + 220 486 round up 500 + 220 round down 200 500 + 200 700 Estimated Answer: 700 - Final, actual answer: 686 So the estimated answer is very close to the real answer. You can estimate with dollar amounts as well. $5.79 - $1.88 $5.79 $6.00 rounded up - $1.88 $2.00 rounded up $6.00 - $2.00 $4.00 Estimated Answer: $4.00 - Actual, computed answer: $3.51 © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
You Try Estimate the answer to the following problem. 379 + 115 What is the best estimated answer? Estimated Answer: 500 (by rounding 379 400 and 115 100) © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
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