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# √10 × √15 is equal to

a. 6√5

b. 5√6

c. √25

d. 10√5

**Solution:**

Given

√10 × √15

It can be written as

= √(2 × 5) × √(5 × 3)

We know that √ab = √a × √b

= 5 × √(2 × 3)

= 5√6

Therefore, √10 × √15 is equal to 5√6.

**✦ Try This: **√16 × √25 is equal to a. 6√5, b. 5√6, c. 20, d. 10√5

Given

√16 × √25

We know that √16 = 4 and √25 = 5

So we get

= 4 × 5

= 20

Therefore, √16 × √25 is equal to 20.

**☛ Also Check: **NCERT Solutions for Class 9 Maths Chapter 1

**NCERT Exemplar Class 9 Maths Exercise 1.1 Problem 11**

## √10 × √15 is equal to a. 6√5, b. 5√6, c. √25, d.10√5

**Summary**:

Irrational numbers consist of non-terminating and non-recurring decimals. √10 × √15 is the multiplication of two irrational numbers. √10 × √15 is equal to 5√6

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