1. The out side !

2. A telephone book (only the wealthy had phones when they first were made).

3. Because 1999 dimes add up to $199.90 – almost $200!

4. Ten of course (“all but ten”)

5. The man was a photographer; he shot a photo of her, developed it in solution and hung it up to dry. (This one will get harder with age, as more people use digital cameras and forget how photos used to be developed.)

6. Just one block – The last one !

If i am right please inform me in message. And share math riddles and puzzle sms on my cell no.
Thanks.