Math, asked by hoodf188, 26 days ago

A student estimated the sum

7.95 + 8.11 + 78.5 + 8.05 + 79.4 + 0.815 as:

All the numbers begin with a 7 or 8, so use cluster estimation.
8 + 8 + 80 + 8 + 80 + 0.8 = 184.8

Explain why this reasoning is not accurate.

Answers

Answered by Anonymous
1

He use the estimation process to round off the decimal. You can use this in practical life as the value didn't vary that much but in theory you can't round off number as it will change the final answer.

EXAMPLE

If you round off the number the answer is 184.8 but

if you add previous numbers the answer will be 182.825.

If you write 184.8 in exam you marks will be deducted that's why his reasoning is not accurate..

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