30 + 90 = 120
10 + 0 =10 ?
Round the highest and lowest numbers. 25 - 5 = 20
Round the highest and lowest numbers. 25 - 5 = 20
841 would round down to 840 and 362 would round down to 360. So 840+360=1200. The sum is about 1200.
Your sum might be less than fifty and you would rather round to forty than zero.
10 + 0 =10 ?
88 is the sum of those two numbers.
17 and 4: sum is 21.
Round the highest and lowest numbers. 25 - 5 = 20
Round the highest and lowest numbers. 25 - 5 = 20
841 would round down to 840 and 362 would round down to 360. So 840+360=1200. The sum is about 1200.
Your sum might be less than fifty and you would rather round to forty than zero.
I would use 40 for the 38 and 50 for the 51. 90 would be my estimate.
250 and 750, which sum to 1000. The exact sum is 1001.
Well, honey, if you wanna estimate the sum of 17 and 75, you could round them both to the nearest ten. So, 17 rounds up to 20 and 75 rounds down to 70. Add those together and you get a rough estimate of 90. But hey, who needs estimates when you can just do the math and get the exact sum of 92?
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.
In arithmetic, estimate usually means rounding the numbers so they're easier to manipulate. Example: Estimate the sum of 432 and 267. You can round them to 430 and 270 and estimate the sum as 700. You could also round them to 400 and 300 and estimate the same total. To estimate a difference, just subtract them. 430 minus 270 is 160. The actual sum is 699 and the actual difference is 165, so your estimates came pretty close.