✕
Subscribe to our free newsletter!
You will be receiving:
fun arithmetic facts
latest Math news and interesting articles
engaging games to polish your Math skills
Simply enter your email in the field:
Join the newsletter
This site is protected by reCAPTCHA and the Google
Privacy Policy
and
Terms of Service
apply.
If you do not wish to provide your email address, you can always subscribe to push notifications
Join the push notifications
Enter your email
play
puzzles
articles
about
about
puzzles
articles
play
play
articles
about
Incorrect
Explanation
The harmonica is the world's best-selling musical instrument.
Solve this puzzle
Suppose 1+9+8=1, then what can be 2+8+9?
2
100
10
4