CH : PLAYING WITH NUMBERS
Q.1. Write factors of the following numbers :
(a) 175 (b) 190 (c) 28 (d) 45 (e) 96 (f) 105
Q.2. Write first 6 multiple of
(a) 16 (b) 27 (c) 11 (d) 8 (e) 20 (f) 11
Q.3. Which number is neither a prime nor a composite number.
Q.4. Write the smallest prime number which is even.
Q.5. Except which number every prime number is odd ?
Q.6. Write the difference of any two (a) odd numbers (b) Even numbers
Q.7. What is the greatest prime number between 1 and 20 ?
Q.8. Using divisibility tests, determine which of the following numbers are divisible by 4 and 6.
(a) 144 (b) 216 (c) 148 (d) 222
Q.9. Using divisibility tests, determine which of the following numbers are divisible by 11
(a) 242 (b) 363 (c) 484 (d) 1111
Q.10. Find the common factors of
(a) 65, 50, 125
Q.11. Find the first three common multiples of 11 and 22.
Q.12. Find the prime factorisation of 112.
Q.13. Find the HCF and LCM of 25, 35 and 45 by Prime Factorisation and division method.
Q.14. An oil merchant has 90 litres oil in one drum and 81 litres in another drum. What is the capacity of the
largest container that can be used to completely empty the oil in the drums in exact number of times.
Q.15. Two boys went on a running race. Boy A touches the start pole every 28 seconds, Boy B touches the
same pole every 32 seconds. If they start together, when will they next touch the pole together ?
Q.16. Choose the correct answer :
1. Which of the following numbers are co-primes ?
(a) (14, 35) (b) (18, 25) (c) (31, 93) (d) (24, 62)
2. Prime factors of 266 are
(a) 2, 7, 19 (b) 2, 3, 6 (c) 3, 4, 3 (d) none of these
Answers
Answered by
6
Answer:
Itna bara question o my god
Answered by
4
Answer:
Q.3 = 1
Q.4= 2
Q.5= 2
Q.7= 19
Q.10= 5
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