WEBSITE ↬ i know it!
AUDIENCE ↬ teachers & students
CONTENT ↬ math
GRADE LEVELS ↬ grades K - 5
This website is incredible! If you teach math you have to check it out. Broken down by grade, then separated by strands, it's a great place to allow students to practice their math skills. You can use with or without accounts.
This is also a great way to intro students to skills as well as support the students as they are learning.
*** One thing to note - there is a free version & a paid version. Paid has obvious pros of data collection. But a free account can really help your students without the built in data collection - or you could find a way track it in a notebook or other digital means (a Google Sheet would be cool!). And this would allow for some good data analysis, too!