Numbers that end in a digit of 4 or less should be rounded DOWN to the nearest ten.
Example: 24 rounded to the nearest ten would be 20
Numbers that end in a digit of 5 or more should be rounded UP to the nearest ten.
Example: 28 rounded to the nearest ten would be 30
Estimate by rounding to the nearest ten.​ Then, find the sum.221122plus+33554455​_​_The estimated sum is nothing.
54+86
3
The best estimate for the sum of 4523 and 1234 can be found by rounding each number to the nearest hundred. Rounding 4523 to the nearest hundred gives 4500, and rounding 1234 to the nearest hundred gives 1200. Adding these rounded numbers gives an estimated sum of 5700. This estimate provides a quick approximation of the actual sum while simplifying the calculation.
Benchmarks can be used to estimate sums by rounding the numbers to the nearest easy-to-work-with values, such as whole numbers or multiples of ten. This simplifies the addition process and allows for a quick mental calculation. For example, if estimating the sum of 47 and 36, rounding 47 to 50 and 36 to 40 makes it easier to quickly estimate the sum as 90. This method provides a close approximation, helping to assess the reasonableness of the actual sum.
Estimate by rounding to the nearest ten.​ Then, find the sum.221122plus+33554455​_​_The estimated sum is nothing.
rounding
54+86
3
The best estimate for the sum of 4523 and 1234 can be found by rounding each number to the nearest hundred. Rounding 4523 to the nearest hundred gives 4500, and rounding 1234 to the nearest hundred gives 1200. Adding these rounded numbers gives an estimated sum of 5700. This estimate provides a quick approximation of the actual sum while simplifying the calculation.
7.000
900
A mathematician in a hurry or one who is only interested in an approximate answer does it.
106 + 091 = 197 100 + 100 = 200 Answer: 3
You can calculate 3444 times 670 without rounding or you can estimate it WITH rounding. But you cannot estimate it without rounding.
400 + 500 = 900
To estimate the sum of 56 and 58, you can round both numbers to the nearest ten. Rounding 56 to 60 and 58 to 60 gives you an estimated sum of 120. Therefore, the estimate of 56 plus 58 is approximately 120.