This question is based on the rounding off rule. Therefore, Keisha estimate of the sum is 630.
Given:
Keisha estimates 259 + 372 by rounding each number to the nearest 10.
We need to determined the what is Keisha estimate of the sum.
According to the question,
By using the round- off rule as follows:
- If the numbers are 5, 6, 7, 8, or 9, round the number up.
Example: 38 rounded to the nearest ten is 40. ...
- If the number are 0, 1, 2, 3, or 4, round the number down.
Example: 33 rounded to the nearest ten is 30.
First we rounding off the 259,
From the first rule, 259 is round the number up.
Therefore, we get the value 260.
Now,rounding off the 372,
From the second rule, 372 is round the number down.
Therefore, we get the value 370.
Now, sum up the both numbers,
260 +370 = 630
Therefore, Keisha estimate of the sum is 630.
For more details, prefer this link:
https://brainly.com/question/7378412
