Millie wrote about learning to count in tens and included 3 word problems. The first problem asked how many horses Millie would have if she started with 87 horses and bought 10 more. The second problem asked how many Jack Russells Lily would have if she started with 71 and brought 10 more. The third problem asked how many kittens Grace would have if she started with 325 and found 60 more in her bookshelf.