I was never good with numbers so didn't actually tried those calculations, but just reading the book was like enlightenment. (We got pleased too quickly as kids...).
Thanks for this!
Edit. My memory is very hazy! I read most of her books, these examples were in her "Puzzles to Puzzle you" and other books. Or maybe not, but here are some more: (found on a pdf... http://sriramanavidyalaya.school/assets/files/More%20Puzzles...)
Edit. Check out 66th puzzle. Not related to examples, but hey -- this is something I still use to get paid! Highly recommend this book for your young ones. :)