Estimation is making a rough calculation of the number, such as a value or quantity of something. 
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Example 1: We can estimate addition and subtraction by rounding. 43 + 28 = _____ Rounding the numbers we get: 40 + 30 = _____ 40 + 30 = 70 This is a close approximation of 43+28 which is equal to 71. Example 2: Sometimes we can quickly guess the correct answer to a math problem by simply starting the solution. Let's look at the following multiple choice math question. What is the answer to the following multiplication problem 23 x 47 = _____ (a) 1288 (b) 1081 (c) 8227 We don't need to actually do the whole multiplication. We can guess the answer as shown below: 2 3 7 x 3 = 21 Last digit in the product must be 1. 

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