This PDF includes one center for math. In this center, students need to match three forms of numbers: word form, decimal form, and fraction (mixed number) form. They can record them on their answer sheet as they match them. As an added challenge, I ask higher students to sort them in order from least to greatest.
These cards go to the hundredths place, although some cards only go to the tenths place. I used this in correlation to the NYS 4th Grade Math Module 6, which is about decimals. These are aligned with the common core state standard 4.NF.C. These could be used in higher grades as well to increase fluency or to help students who struggle in higher grades.
This center includes 90 cards, which should make 30 matches (there are three cards to be matched in each set as stated above). I split these up into groups of about 15 sets so that it's not overwhelming for the kids to find the matches, but you could also give them it all. It just depends on your preference.
This also includes a recording form if you choose to use it- I have a plain version as well as a fancier, colorful version. You can see them in the sample images.