Hi Abid Riaz, thanks for your feedback.

Just a thought - if you allow yourself a cheat sheet for being foreign, and remember that the half dollar is bigger than the dollar, the dime is the smallest coin in mm, and otherwise size follows value, you should be able to do the exercises. That's how I did them. The coin images are deliberately blurred so you have to go by size and convert it to value, which makes it more difficult for US citizens too.

https://khanacademy.zendesk.com/hc/en-us/articles/202522414-Inches-and-feet-cents-and-dollars-for-non-US-citizens

Being able to recognize other coins and compute their value is a valuable life skill if you ever intend to travel abroad.

I also don't know what a dime is. It is needlessly excluding and demotivating when doing a progress measuring test.

Yep must agree with op.

The response by Inger, which includes a reference to a 'dime'....how much is a dime?! (10 cents, Google squared me away).

Either allow local currencies, put the value on the question or remove them. Not everyone lives in the USA (as lovely a country as it is!)