21. If we divide the sum of 45 and 90 by their difference, the answer is
Answer:
(C) The least odd Prime number
Explanation:
The sum is 45 + 90 = 135. The difference is 90 – 45 = 45. The division is 135 ÷ 45 = 3. The number 3 is the least odd prime number.
22. I am a prime number. If you subtract 1 from me, I will become divisible by 9. Who am I?
Answer:
(B) 19
Explanation:
Testing the options: 19 is a prime number, and 19 – 1 = 18, which is divisible by 9.
23. HCF of 90, 96, and 10 is
Answer:
(A) 2
Explanation:
The factors of 10 are 1, 2, 5, 10. Both 90 and 96 are divisible by 2. They are not both divisible by 5 or 10. Therefore, the Highest Common Factor (HCF) is 2.
24. Compare 119 ☐ 52
Answer:
(B) >
Explanation:
To compare the fractions, convert them to decimals: 119 is approximately 0.818, and 52 is 0.4. Since 0.818 is greater than 0.4, 119 > 52.
25. The largest prime number between 1 and 100 is
Answer:
(B) 97
Explanation:
A prime number is only divisible by 1 and itself. 97 is the largest number less than 100 that fits this description.
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