Having this set of things that start with u cards as part of your teaching resources could help you distinguish between short u and long u. The words on these cards have five words with short u and three with a long u. The words are: umbrella, umpire, under, underwear, unicorn, unicycle, uniform, and upstairs. Words starting with long u are few and far between. You may notice that the three in this set all start with “uni”.
12 cards, 3 pages with 4 cards per page.
CCSS RF.K.3.A & RF.K.3.B
Go to this page to see all the things that start with a to z cards in this set.