Saw 1st grade students working on this in the classroom and brought it into Physical Education. Students pair up with worksheet and have to find the missing number. The missing number corresponds to the exercise they pair will have to do. Then the answer after the equals sign tells the students how many they will have to do. After the pair does that exercise, they will then solve the next math problem. I laminated the worksheets and used a dry erase marker to use the same sheets for the classes. (Thanks to Ross Chakrian for his gifs!)

Worksheet: https://drive.google.com/open?id=1EncdKninCCw6zfJvmHlnxPAwTbvr7rVA

Google Slides with exercises: https://drive.google.com/open?id=1tjS-7RfszC3LhC-PGWUazVrazO6vsd-SU67p1ULzYaQ