Question

1. How many natural numbers are there from 10² to 20² ?
a) 299
b) 300
c) 301
d) 400​

Answer 1

Step-by-step explanation:

We know that,

(9)2 = 9*9 = 81

(10)2 = 10*10 = 100

Total natural`number between square of 9 and square of 10 -

Starting from 82 and up to 99. As 81 and 100 both will not be included in these natural numbers. The natural numbers are -

82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 and 99

Therefore,between (9)2 and (10)2 , there are total 18 natural numbers.