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Fractions equal to 7/9 are 14/18,21/27, 28/36, 35/45....and so on.
In order to add or subtract one fraction from another, they must have a common denominator, or the same denominator. That's because it's impossible to add two fractions that have a different number of parts.
the fraction 22/7 is often used as an approximation for the value of pi. it is off from the actual value by about 0.04 percent (1 in 2500). This would be like measuring a football field and being off by about 1.5 inches on your measurement. The fraction 355/113 is amazingly close, better than 1 part in 10 million
hundred thousand
The value of the position of a digit in a number.