An easy way to think of division is when you are dividing something, you are sharing something into groups.
Say you have 3 books. If you share it into 3 groups, you get 1 book in each group. Therefore, whenever a number is divided by itself, the answer is always 1.
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Because a number will divide into itself once 1
You cannot divide 73. If you divide it you will get any answer in decimals. 73 is a prime number. So it can only be divided by 1 and itself.
you change all mixed numbers to improper fractions.
The number 107 is a "prime" number. That means that only the number 1 and the number itself will divide into it.
17 is prime - it can only be divide by 1 & itself.