Estimates help in computation and measuring. Estimation is not guessing, it involves some form of reasoning, computation, but not guessing.
There are a number of strategies you can use to estimate values. Here are some ways of estimating.
Example 1: For addition and subtraction
Example 2: Rounding to a “nice” number: 300 or 400.
Example 3: With a lot of numbers. Round to tens.
Example 4: Using compatible numbers
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Question 1 of 4
1. Question
Round each number.

Round each number to the nearest ten
34 is about
82 is about
91 is about
79 is about
48 is about
68 is about
Round each to the nearest hundred.
546 is about
214 is about
857 is about
937 is about
112 is about
674 is about
Round each number to the nearest thousand.
2771 is about
7529 is about
10708 is about
9337 is about
73459 is about
6224 is about
Correct 18 / 18 PointsIncorrect / 18 Points 

Question 2 of 4
2. Question
CorrectIncorrect 
Question 3 of 4
3. Question
Determine if the following calculations are over or under a certain number.
Example:
Is 20 + 75 over or under 100
Answer: under 100

Is 37 +75 over or under 100?
Answer:
Is 76 +26 over or under 100?
Answer:
Is 432 + 255 over or under 600?
Answer:
Is 546 – 51 over or under 400?
Answer:
Is 845 – 35 over or under 800?
Answer:
CorrectIncorrect 

Question 4 of 4
4. Question
Write the estimate nearest to the thousands, then compute the exact answer.

Estimate 1985 + 2656
Estimate 2068 + 4937
Correct 7 / 7 PointsIncorrect / 7 Points 