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Of course! Without decimals, you couldn't calculate percentages or fractions. Decimals allow you to break a number up. A decimal is basically a fraction, and when you calculate fraction adding, subtraction, multiplication, and division, sometimes it is easier to calculate a fraction by first changing it to a decimal instead.
In order to calculate fractions, you need to know two numbers ... the part and the whole. Since you didn't say 7 oranges out of whatever the total is, we can't calculate a fraction.
all of them. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
In the same way as you would with numbers which are not fraction. Add together the fractions and divide by their count.
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.