Question

hey im in 10th ! 
chptr- 1 ! 
real numbrs ! say me any question ! 
atlst 5 ! 

Answer 1

1. Find HCF of 105 and 1515 by prime factorisation method and hence find its LCM.
2. Find the smallest number which when increased by 17 is exactly divisible by both 520 and 468
3. A  rectangular hall is 18m 72cm long and 13m 20cm broad. It is to be paved with square tiles of the same size. Find the least possible number of such tiles.
4. Express each numbers as product of prime factors
    a) 120       b) 3825    c)6762    d)32844

1. Verify the commutative property of union and intersection of sets for the following
     A={l,m,n,o,p,q}  B={m,n,o,r,s,t}
2. Given P={a,b,c,d,e} Q= {a,e,i,o,u}  R={a,c,e,g} verify associative property of union and intersection of sets.
3. If A={2,3,5,7,11,13} B={5,7,9,11,15} are the subsets of u={2,3,5,7,9,11,13,15} verify DeMorgan's law.
4. If A and B are the sets such that n(A)=37 n(B)=26 and n(AUB)=51, find n(A intersection B)

Answer 2

1) prove each as the product of its prime number
140 
156
5005
2) find HCF of 135 and 225 by using Euclid's division?
3) write the following in decimal form?
11/17
44/100
4) express the 451/13 as the decimal fraction
5)HCF of 84 270 ?