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a method in which the value of a unit quantity is first obtained to find the value of any required quantity is called unitary method.
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Unit means one . observation used in unitary method are MULTIPLIACATION and DIVISION

Eg. 3 books cost rs 360. Find the cost of 5 books
    Step 1~ ( divide ) cost of i book = 360 divided by 3 = 120
    Step 2 ~ ( Multiply ) So cost of 5 books is = Rs 120 multiplied by 5 = 600 ans 

So, It's nothing first you have to divide the digits and find the cost of 1 book and then multiply it to the other number in which you have to find the answer thatt was 5 so The cost of 5 books would be 600. So, first divide the find the 1 thing and then multiply to find the real answer with the quotient which came while dividing. And here you have the answer!
1 5 1
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