how can I say "guess" in Japanese?
当てる - I have found that this one can also mean 'guess'
but how do you use it? or is there any other word that's more common?

例 would be appreciated, thank you. :)

Question

how can I say "guess" in Japanese?
当てる - I have found that this one can also mean 'guess'
but how do you use it? or is there any other word that's more common?

例 would be appreciated, thank you. :)

Answer

Example 1: 
「何歳？: How old are you?」
「何歳だと思う？: What do you think how old I am? 当ててみて: Guess it」
「当たり！: That's right!」

Example 2:
「今、何考えてるのか当てようか？: Shall I guess/tell what you are thinking now?」

I hopt they help you to understand the meaning better.

Answer

推測する　suisoku すいそく