Maths - Is my house number odd or even?

We got the appropriate number of counters to match our house numbers. We sorted them into groups of ten (because that made it easier to keep track of our counting) and we paired each counter. We knew that if each counter had a partner, it was an even number, but if there was a counter left alone, it was an odd number.



Jak's house number is 242. Wow! That's a lot of counters!