Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

What is the additive identity in rational numbers?

Answer and explanation

Correct answer: (0)

Direct answer: Option B, 0. An additive identity is a number which leaves another number unchanged when added to it. Let any rational number be \(r\). Then \(r+0=r\), so zero does not alter the value. This is why 0 is called the identity for addition. Option A, 1, is not the additive identity because \(r+1\) is usually different from \(r\); 1 is the multiplicative identity because \(r\times1=r\). Option B is correct because adding zero keeps every rational number unchanged. Option C, -1, changes the number to \(r-1\), so it is not an identity. Option D, 2, changes the number to \(r+2\), so it also fails. The word “additive” is an important clue: look for the number used in addition, not multiplication. For example, \(\frac{5}{7}+0=\frac{5}{7}\) and \(-3+0=-3\). Remember: additive identity is 0; multiplicative identity is 1.

Related tags

Rational NumbersClass 9Additive Identity

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.