It's Friday, March 14 —3/14, the day that every math nerd eagerly anticipates each year. Known around the world as "Pi Day." ...

Move left to the next place value column. Subtraction of decimals can be used to work out how much change is needed when shopping. Calculations that involve money use the addition and subtraction ...

To multiply decimals by 10, 100, and 1000, use place value labels. Write the digits of the decimal using place value labels. Start with the first non-zero digit. To multiply by 10 move each digit ...