Hello sir.i am Adil khan .my brother studies went to class 9 this year and he loves maths like me .i want to ask which maths books are good for him to study except iit foundation series which he already has.

What are the differences between similar triangles and congruent triangles?

What are Armstrong numbers?

All real numbers are rational numbers.

A) True

B) False

The L.C.M of the smallest 2 digit composite number and the smallest composite number is:

• (a) 12
• (b) 4
• (c) 20
• (d) 44

Are all natural numbers also whole numbers?