10 + 0 =10 ?
Round the highest and lowest numbers. 25 - 5 = 20
Round the highest and lowest numbers. 25 - 5 = 20
30 + 90 = 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.
The answer is zero !
Round the highest and lowest numbers. 25 - 5 = 20
Round the highest and lowest numbers. 25 - 5 = 20
you can use whole numbers
30 + 90 = 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.
To quickly estimate a sum, you round both numbers to the nearest easy significant figure. In this case 8.91 can be rounded up to 9. 1.16 can be rounded down to 1. You then complete the sum with the rounded figures. 9+1 = 10, so the estimate of 8.91+1.16 is 10.
88 is the sum of those two numbers.
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?
17 and 4: sum is 21.
The sum of all the numbers from 101 through 200 is 15,050.
The answer is zero !
The sum of all odd numbers 1 to 120,000 is 14,400,000,000.