Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 9

EASY

10th CBSE

IMPORTANT

Earn 100

If the rational number $\frac{a}{b}$ has a terminating decimal expansion, what is the condition to be satisfied by $b$ ?

Important Questions on Real Numbers

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 10

Simplify

\frac{2 \sqrt{45} + 3 \sqrt{20}}{2 \sqrt{5}}

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 11

Write the decimal expansion of

\frac{73}{(2^{4} \times 5^{3})}

.

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 12

Show that there is no value of

n

for which

(2^{n} \times 5^{n})

ends in

5

.

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 13

Is it possible to have two numbers whose HCF is

25

and LCM is

520

?

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 14

If two irrational numbers are

4 + \sqrt{5}

and

m - \sqrt{n}

, where

m, n \in N

, and their sum is

8

i.e., a rational number, then find the value of

m + n

.

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 15

State whether the product of two irrationals

4 \sqrt{5}

and

3 \sqrt{5}

is rational or irrational.

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 16

If

a

and

b

are relatively prime, what is their

LCM

?

EASY

10th CBSE

IMPORTANT

Secondary School Mathematics for Class 10>Chapter 1 - Real Numbers>Exercise 1E>Q 17

The LCM of two numbers is

1200

. Show that the HCF of these numbers cannot be

500

. Why ?