Question

What is the rounding or compatible numbers to estimate the sum of 87+34

Answer 1

Answer: sum = 1200.

Step-by-step explanation:

Since we have two digits are numbers are given ,

So the only possible rounding or estimation will be done nearest to ones .

Rounding integers to nearest ones ,

$87\text{ changes to }90\\34\text{ changes to }30$

So,

Sum is given by

$90+30=1200$

So, our  sum will be 1200.

Answer 2

87 + 34

87 rounded = 90

34 rounded = 35

90 + 35 = 125

or

87 rounded = 90

34 rounded = 30

90 + 30 = 120

when rounding you are only getting an estimate so it is not going to be exact however you do it.