alleryStart learning →If HCF(a, b) = 9 and a · b = 1620, find LCM(a, b).
- 1620
- 180
- 80
- 9
Show answer and solution
Correct answer: B. 180
HCF × LCM = a × b, so LCM = 1620 / 9 = 180.
Andhra Pradesh SSC (Class 10) Real Numbers and Polynomials — practice questions — page 4
Explore 115 free Real Numbers and Polynomials questions in Andhra Pradesh SSC (Class 10) Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 91–115 of 115.
If HCF(a, b) = 9 and a · b = 1620, find LCM(a, b).Read the answer and worked solution →Two bells ring at intervals of 9 and 15 minutes. They ring together at noon. When do they ring together again?Read the answer and worked solution →Which of the following is an irrational number?Read the answer and worked solution →Will the decimal expansion of 13/125 terminate?Read the answer and worked solution →The decimal expansion of 1/6 is:Read the answer and worked solution →Which of the following will have a terminating decimal expansion?Read the answer and worked solution →Numbers that fill the number line completely (every point on the line corresponds to such a number) are called:Read the answer and worked solution →If p is prime and p divides a², then p divides a. This step is used to prove which number irrational in your syllabus?Read the answer and worked solution →Euclid's division lemma for integers a, b > 0 says there exist q, r such that:Read the answer and worked solution →For two positive integers, HCF × LCM equals:Read the answer and worked solution →Degree of 5x³ − 2x² + 7 is:Read the answer and worked solution →For ax² + bx + c, the sum of roots equals:Read the answer and worked solution →For two positive integers, HCF × LCM equals:Read the answer and worked solution →Pop only the prime numbers.Read the answer and worked solution →Continue the arithmetic progression.Read the answer and worked solution →Pop only the perfect squares.Read the answer and worked solution →Continue the powers of 2.Read the answer and worked solution →Continue the arithmetic progression.Read the answer and worked solution →Pop only the irrational numbers.Read the answer and worked solution →Match each trig ratio to its definition in a right triangle.Read the answer and worked solution →Sort each number as Prime or Composite.Read the answer and worked solution →Pythagorean theorem.Read the answer and worked solution →AP nth term formula.Read the answer and worked solution →CLASS10 · Mathematics · HCF & LCM PairsRead the answer and worked solution →CLASS10 · Mathematics · Polynomial Zeros & CoefficientsRead the answer and worked solution →
Worked practice questions
Two bells ring at intervals of 9 and 15 minutes. They ring together at noon. When do they ring together again?
- after 9 min
- after 15 min
- after 30 min
- after 45 min
Show answer and solution
Correct answer: D. after 45 min
Meeting time = LCM(9, 15).
9 = 3², 15 = 3·5. LCM = 3²·5 = 45. They ring together again 45 min after noon.
Which of the following is an irrational number?
- 0.333…
- √5
- 22/7
- 3.14
Show answer and solution
Correct answer: B. √5
√5 cannot be written as p/q with integer p, q.
**The other three are rational:** 22/7 by construction, 3.14 = 314/100, and 0.333… = 1/3.
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