Why might you round to The nearest ten instead of the nearest hundred when you estimate a sum?
you need greater accuracy
Rounding to the nearest ten instead of the nearest hundred when estimating a sum can be useful in scenarios where you want a quick and rough estimate. Rounding to the nearest ten allows for a quicker mental calculation and can still give you a fairly accurate estimate.
To round to the nearest ten, you look at the digit in the ones place. If it is less than 5, you round down to the nearest ten. If it is 5 or greater, you round up to the nearest ten.
For example, let's say you want to estimate the sum of 64 and 87.
If you were to round to the nearest hundred, you would round both numbers to the nearest hundred, which would be 100. So the estimated sum would be 100 + 100 = 200.
But if you were to round to the nearest ten, you would round 64 to 60 and 87 to 90. So the estimated sum would be 60 + 90 = 150.
Rounding to the nearest ten can provide a more precise estimate than rounding to the nearest hundred when the numbers you are working with are closer in value. It allows you to capture the general magnitude of the sum without getting too bogged down in the details.