# Important Concepts of Number System For RRB Stage – II : 28th November

Mathematics is an equally important section for RRB Stage II exam and has an even more abundant importance in some other exams conducted by RRB & SSC. Generally, there are questions asked related to basic concepts and formulas of Number System.
To let you make the most of Mathematics section, we are providing important facts related to Number System. Also, Railway Exam Stage II is nearby with bunches of posts for the interested candidates in which Mathematics is a major part. We have covered important notes and questions focusing on these prestigious exams. We wish you all the best of luck to come over the fear of Mathematics section.

Number System

1. L.C.M. and H.C.F. of Fractions

L.C.M=(L.C.M.of the numbers in numerators)/(H.C.F.of in the number in denominator)
H.C.F=(H.C.F.of the numbers in numerators)/(L.C.M.of in the number in denominator)

2. Product of two numbers

= L.C.M. of the numbers × H.C.F. of the numbers

3. To find the greatest number that will exactly divide x, y and z.

Required number = H.C.F. of x, y and z.

4. To find the greatest number that will divide x, y and z leaving remainders a, b and c, respectively.

Required number = H.C.F. of (x – a), (y – b) and (z – c).

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