Directions: mark against the correct answer:
1.252 can be expressed as a product of primes as:
a) 2 x 2 x 3 x 3 x 7 (b) 2 x 2 x 2 x 3 x 7
c) 3 x 3 x 3 x 3 x 7 (d) 2 x 3 x 3 x 3 x 7
2. which of the following has most number of divisors?
a) 99 (b) 101
c) 176 (d) 182
3. A number n is said to be perfect if the sum of all its divisors (excluding n itself) is equal to n. an example of perfect number is:
a) 6 (b) 9
c)15 (d) 21
4. 1095/1168 when expressed in simplest form is:
a) 13/16 (b)15/16
c) 17/63 (d) 25/26
5. reduce 128352/238368 to its lowest terms.
a) 3/4 (b) 5/13
c) 7/13 (d)9/13
6. H.C.F. of 2²
x 3³
x 5⁵,
2³
x 3²x
5²x
7 and 2⁴ x 3⁴ x 5 x 7²
x 11 is:
a)
2²
x 3³
x 5 (b) 2² x 3² x 5 x 7 x 11
c) 2⁴ x 3⁴ x 5⁵ (d) 2⁴
x 3⁴
x 5⁵
x 7 x 11
7. The H.C.F. of 2⁴x 3² x 5³ x 7,
2³x 3³ x 5²x 7² and 3 x 5 x 7 x 11 is:
a) 105 (b) 1155
(c) 2310 (d) 27710
8. H.C.F. of 4 x 27 x 3125, 8 x 9 x 25 x
7 & 16 x 81 x 5 x 11 x 49 x is:
a) 180 (b) 360
c) 540 (d) 1260
9. find the highest common factor of 36 and 84.
a) 4 (b) 6
c) 12 (d)18
10. the H.C.F. of 204, 1190 and 1445 is:
a)17 (b) 18
c) 19 (d) 21
No comments:
Post a Comment