This 10 More 10 Less view finder for the 100s chart helps kiddos develop number sense and make connections on the 100s chart. Cut out the middle square and place it over any number on the 100s chart. Then flip up the 10 Less flap to reveal the number that is 10 less. Filp up the 10 More flap to reveal the number that is 10 More. Continue on with the 1 More and 1 Less flaps.