Question

Please solve and explain the question

Answer 1

a)90,
b)112,
c)99

it is too easy

Answer 2

Hi there !!!
Here is your answer.....
First, The Actual sum :-
1) 78 +12= 90
2) 95 + 17 =112
3)66+ 33 = 99
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Now the sum of estimated.....
The Sum of estimated is very simple as to round the number by changing them to nearest power of tens, hundreds, and thousand, etc....
In first 1) 78 is nearer to the 80 in once place so it is change in 80 and and 12 is change in 10 so their sum will be 90.....
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In second 2) 95 changes into 90 and 17 into 20 respectively so their sum will be 110......
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In Third 3) 66 changes into 70 and 33 changes into 30 so their sum will be 100.....
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Thank you ☺️