52+39 rounding or campatible numbers to estimate sum

The estimated sum is 90

Explanation:

To get the estimated sum, we will round the given numbers to the nearest tens

Remember that:

To round to the nearest tens, we check the digit in the units place

If this digit is less than 5, we round down

If the digit is greater than or equal to 5. we round up

Now, for the given numbers:

52: The number in the units place is 2 which is less than 5, so we round the 52 down to 50

39: The number in the units place is 9 which is greater than 5, so we round the 39 up to 40

Now, it is easier to compute the estimated sum using the rounded numbers:

50 + 40 = 90

Hope this helps :)

sine

step-by-step explanation: