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Subjects
Class 10MathematicsReal NumbersEuclid’s Division LemmaHardLevel 1
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If (x) leaves remainder 7 when divided by 10, what is the remainder when (3x) is divided by 10?

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Answer and explanation

Correct answer: 1

Step 1: Write (x=10q+7). Step 2: (3x=30q+21=10(3q+2)+1), so the remainder is 1. Step 3: In multiplication questions, multiply the remainder and reduce it by the divisor.

Related tags

Euclids-Division-LemmaRemainder-MultiplicationHard

Frequently asked questions

What is the correct answer to this question?

1

Why is this the correct answer?

Step 1: Write (x=10q+7). Step 2: (3x=30q+21=10(3q+2)+1), so the remainder is 1. Step 3: In multiplication questions, multiply the remainder and reduce it by the divisor.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Euclid’s Division Lemma.

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10 more MCQs
  1. 1In Euclid’s Division Lemma, if (a) and (b) are positive integers, which condition is correct for the remainder (r)?
  2. 2If (35=6q+r) and (0 \le r < 6), what are the values of (q) and (r)?
  3. 3Which is the standard form of Euclid’s Division Lemma?
  4. 4If a number leaves remainder (0) when divided by (9), in which form can it be written?
  5. 5What possible remainders can occur when an integer is divided by (5)?
  6. 6What is the remainder when (52) is divided by (7)?
  7. 7Which condition is necessary for (b) in Euclid’s Division Lemma?
  8. 8If (a=17) and (b=4), which is the correct Euclidean form (a=bq+r)?
  9. 9How many possible remainders are there when a number is divided by (3)?
  10. 10If a number is odd, what remainder will it leave when divided by (2)?
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