Ex:
Pedro has 36 DVD´s of series and 57 DVD´s of movies. If he has 100 spaces, does he have enough for the DVD´s? Round to the nearest ten to estimate the sum.
36 rounds up to 40
+57 rpunds up to 60
-------
100 He has enough spaces
Each addened was rounded up so the estimated sum is greater than the actual sum. It is overestimate.
Underestimate : An underestimate happens when you round down.
Sara was in charge of seating the school show. She has set up 34 seats in the center and 23 seats on each side. She is expecting 70 people. Has she set up enough chairs? Round to the nearest ten to estimate the sum.
34 rounds down to 30
23 rounds down to 20
+23 rounds down to 20
-----
70 seats is the estimated sum.
Each addened ws roundes down, so she estimated the sum, 70, is less than the actual sum. It is an underestimated.
Estimate each sum by rounding to the nearest ten. Then tell whether each estimate is an overestimate or underestimate.
ex: 36+47 : (40+50) we overestimate.
- 23+44 :
- 66+87:
- 98+27:
i've a question. say we had to find whether our estimate was over or under. the calculation is 16.5*19.2/33.6-21.9, my estimate was 40 as according to gcse standards, you round to 1 significant number when estimating. However, my real answer is 27 therefore my estimate was an overestimate; but according to my calculations of weighing the differences in the amount in which numbers have been rounded up and down, my answer comes as an underestimate. Basically, can you tell me if when weighing estimations and there is a subtraction sum, would you add the differences together or subtract the differences together. Please reply, this is urgent!!!!
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