Counting in 25s, 50s and 100s Counting in 25s is related to counting in 50s and counting in 100s. Let's look at the relationship between them using bar models.

STATEN ISLAND, N.Y. — Counting to 100 is an easy thing to do — unless you’re younger than 2 years old. Then imagine being able to count to 100 in seven different languages by the time you ...