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# How Do You Estimate?

**To estimate a number in math, round the last digit of a number up or down to the nearest zero number.** This is sometimes referred to as the nearest 10.

An example of estimating would be 123 + 16. If the last number is less than five, then round down to a zero number, in this case 120. If the last number is five or greater than five, then round to the higher zero, in this case 20. Therefore, the problem would become 120 + 20 = 140. Estimation is commonly used in multiplication, division, algebra and other mathematical disciplines.

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## What Is the Divisibility Rule for 7?

A: The divisibility rule for 7 dictates that a number is divisible by 7 if subtracting 2 times the digit in the one's column from the rest of the number, now ... Full Answer >Filed Under: -
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## How Do You Round a Number to the Place Value of an Underlined Digit?

A: Round a number to the place value of an underlined digit by leaving the underlined digit unchanged or increasing it by one and then changing all the digits... Full Answer >Filed Under: -
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## How Do You Use Front End Estimation to Estimate Numbers?

A: Round each number in the question to only have one non-zero digit. For example, 64 becomes 60, and 1,890 becomes 2,000. Then do the calculation required. Full Answer >Filed Under: -
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## How Do You Write the Value of the Underlined Digit?

A: The value of an underlined digit in a given number expresses how much that digit is worth. To determine the digit’s value, multiply it by its place value. ... Full Answer >Filed Under: