Subtraction in 60 Publisher: andrew smith Genre: Education Released: 16 Feb, 2014 Size: 500.0 KB Price: $0.99 Click here to request a review of this app App Store Info Description How many subtraction problems can you do in 60 seconds? How accurate will you be? Subtract with numbers from 1-100 in 60 seconds and see your accuracy as well as how many you got right and how many wrong. Screenshots Screenshot 1 of 3