Estimation of Numbers

Estimation of numbers is the process of making an educated guess or approximation of a numerical value without calculating it precisely. It is a useful skill that helps in daily life situations such as grocery shopping, budgeting, and planning.

Steps to Estimate Numbers

1. Round off the numbers to the nearest place value. For example, if the number is 347, round it off to 350 or 300.

2. Use compatible numbers that are easy to work with. For example, if the problem is 24 x 7, you can round 24 to 20 and 7 to 5, making the calculation easier to solve mentally.

3. Use benchmarks or reference points to compare and estimate. For example, if the problem is to estimate the weight of a pumpkin, you can use a reference point of 1 pound per inch of diameter to estimate the weight.

Answer to the Question

Given: 3 digit number having 7, 5 and 4. The difference between the highest and the lowest place digits is 1.

To find the number, we need to use estimation.

1. We know that the number has 3 digits, so we can assume that it is between 100 and 999.

2. We know that the difference between the highest and lowest place digits is 1, so the number must be close to 475 or 745.

3. We can use compatible numbers and estimate that the number is approximately 600.

Therefore, the estimated 3 digit number having 7, 5 and 4 with the difference between the highest and the lowest place digits in 1 is 600.

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