Question

if tens digit of a perfect square is 7,how many possible values can its unit digit have?please show process.

Answer 1

is this a 2 digit number?

Answer 2

go to this website http://en.wikibooks.org/wiki/Primary_Mathematics/Print_version

Answer 3

no specification given can be any two or more than two

Answer 4

right

Answer 5

your answer is on the website

Answer 6

i can see a list of squares up to 400 on that website - that all
up to 400 - none of them have 7 as tens digit

Answer 7

24 square has i.e 576 but there may be other no. too!

Answer 8

the answer is i dont know im afraid - as you know there are an infinity of numbers so there might be some - im not an expert on number theory

Answer 9

right - then there is probably many more not necessarily ending in 6

Answer 10

yeah