Question

How many naural numbers lie between 9 and 10 square? Between 11 and 12 square?

Answer 1

9 square= 81
10 square=100 nos. in b/w =18
11^2=121
12^2=144 nos in b/w =22

Answer 2

here is your answer
between 9 sq. and 10 sq. =2×9=18
between 11 sq. and 12 sq. =2×11=22
HOPE IT HELPS