multiply the denominator (bottom number) by the whole number and add that to the top number.
for example.
7 and 1/4
7x4=28
28+1 =29
29/4
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Subtracting a mixed number is just subtracting fractions but with a whole number by a fraction. To subtract tun the mixed numbers into improper fractions and find the common denominator. Then you subtract the numerators.
s+s=d-s+pRULE
To find a volume you usually need to multiply values together. When working with mixed numbers it is usually easier to convert them into improper fractions, do the calculations and convert any resulting improper fraction into a mixed number. So you don't need to use either format, it's just that improper fractions are easier to manipulate.
The same as you find the average of any other type of number. You add the numbers, then divide the result by the amount of numbers. For example, to find the average of three different numbers, you add them all, then divide the result by 3.
Prime numbers are used to find the LCM of numbers Prime numbers are used to find the HCF of numbers Prime numbers are used to simplify fractions Prime numbers are used to find the LCD of fractions