Question

the square of which number would be an odd number 525 or 267 or 24 or 190​

Answer 1

by using various estimation method:-

square of number have 0,1,2,3,4,5,6,7,8,9 in unit place will have 0,1,4,9,5,9,4and 1 respectively in their unit place

thus 525 and 267 will have odd squares