Q: Estimate the sum using only the front digits 862 plus 695?

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By using front end estimation, the numbers that you start of with have only one significant digit. It is, therefore, nonsense to have an answer with loads of significant digits.

999

24

By rearranging the digits the answer is 123.

Standard Form

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It means using only the first non-zero digit (rounded up if required), and replacing all other digits by zero.

Yuo can make only one combination of 30 digits using 30 digits.

By using front end estimation, the numbers that you start of with have only one significant digit. It is, therefore, nonsense to have an answer with loads of significant digits.

A Social Security Number should only be composed of nine digits. Three digits then a dash, three more digits then another dash, and three final digits should be the only numbers.

999

24

By rearranging the digits the answer is 123.

99.99

Standard Form

Assuming each of the given digits can be used only once, the answer is 24. If not, the answer is infinity.

Using only positive digits, and disregarding their order, 3 ways.

22+2=