Concept-wise Practice

reduced denominator MCQ Questions for Class 10

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Practice Questions

5 questions tagged with reduced denominator.

Question 1/5 Hard Mathematics Real Numbers 7: Decimal expansion of rational numbers Class 10 Level 19

\(\frac{27}{990}\) का दशमलव प्रसार कैसा है?

What type of decimal expansion does \(\frac{27}{990}\) have?

Explanation opens after your attempt
Correct Answer

B. असांत आवर्तीNon-terminating recurring

Step 1

Concept

\(\frac{27}{990}=\frac{3}{110}\).

Step 2

Why this answer is correct

\(110=2\cdot 5\cdot 11\), so (11) remains in the denominator. Hence the decimal is non-terminating recurring.

Step 3

Exam Tip

If a reduced denominator has a prime other than (2) or (5), it will not terminate. चरण 1: \(\frac{27}{990}=\frac{3}{110}\) है। चरण 2: \(110=2\cdot 5\cdot 11\), जिसमें (11) बचता है। इसलिए दशमलव असांत आवर्ती होगा। चरण 3: सरलतम हर में (2) और (5) के अलावा कोई गुणनखंड रहे तो सांत नहीं होगा।

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Question 2/5 Medium Mathematics Real Numbers 7: Decimal expansion of rational numbers Class 10 Level 21

यदि \(\frac{b}{180}\) सरल करने पर हर (20) रह जाता है, तो दशमलव प्रसार कैसा होगा?

If \(\frac{b}{180}\) reduces to a fraction with denominator (20), what type of decimal expansion will it have?

Explanation opens after your attempt
Correct Answer

A. समाप्तTerminating

Step 1

Concept

After reduction, the denominator is (20).

Step 2

Why this answer is correct

\(20=2^2\times5\), so it has only (2) and (5).

Step 3

Exam Tip

Therefore the decimal expansion is terminating. चरण 1: सरल करने के बाद हर (20) है। चरण 2: \(20=2^2\times5\), इसलिए हर में केवल (2) और (5) हैं। चरण 3: इसलिए दशमलव समाप्त होगा।

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Question 3/5 Medium Mathematics Real Numbers 7: Decimal expansion of rational numbers Class 10 Level 21

\(\frac{45}{360}\) को सरल करने के बाद दशमलव प्रसार कितने स्थानों पर समाप्त होगा?

After simplifying \(\frac{45}{360}\), after how many places will its decimal expansion terminate?

Explanation opens after your attempt
Correct Answer

C. (3) स्थान(3) places

Step 1

Concept

\(\frac{45}{360}=\frac{1}{8}\).

Step 2

Why this answer is correct

Since \(8=2^3\), the decimal terminates after (3) places.

Step 3

Exam Tip

Do not get confused by the original denominator (360); check the reduced denominator. चरण 1: \(\frac{45}{360}=\frac{1}{8}\) है। चरण 2: \(8=2^3\) है, इसलिए दशमलव (3) स्थानों पर समाप्त होगा। चरण 3: मूल हर (360) देखकर भ्रमित न हों, सरलतम हर देखें।

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Question 4/5 Medium Mathematics Real Numbers 7: Decimal expansion of rationa numbers Class 10 Level 20

यदि \(\frac{a}{72}\) सरल करने पर हर (8) रह जाता है, तो दशमलव प्रसार कैसा होगा?

If \(\frac{a}{72}\) reduces to a fraction with denominator (8), what type of decimal expansion will it have?

Explanation opens after your attempt
Correct Answer

A. समाप्तTerminating

Step 1

Concept

After reduction, the denominator is (8).

Step 2

Why this answer is correct

Since \(8=2^3\), the denominator has only (2).

Step 3

Exam Tip

Always make the final decision from the reduced denominator. चरण 1: सरल करने के बाद हर (8) है। चरण 2: \(8=2^3\), इसलिए हर में केवल (2) है। चरण 3: अंतिम निर्णय हमेशा घटे हुए हर से करें।

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Question 5/5 Medium Mathematics Real Numbers 7: Decimal expansion of rational numbers Class 10 Level 20

\(\frac{64}{4000}\) को सरल करने के बाद दशमलव प्रसार कितने स्थानों पर समाप्त होगा?

After simplifying \(\frac{64}{4000}\), after how many decimal places will its decimal expansion terminate?

Explanation opens after your attempt
Correct Answer

C. (3) स्थान(3) places

Step 1

Concept

\(\frac{64}{4000}=\frac{2}{125}\).

Step 2

Why this answer is correct

Since \(125=5^3\), the decimal terminates after (3) places.

Step 3

Exam Tip

Assuming (4) places from (4000) without reducing is a common mistake. चरण 1: \(\frac{64}{4000}=\frac{2}{125}\) है। चरण 2: \(125=5^3\), इसलिए दशमलव (3) स्थानों पर समाप्त होगा। चरण 3: हर (4000) देखकर (4) स्थान मान लेना सामान्य गलती है।

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