Tag Archives: sets

How to Teach Subitizing: 1 – 4

How to Teach Subitizing: 1 – 4

Some thoughts on learning and teaching subitizing. Including 17 downloadable 4×6 flashcards that you can use to teach your child to subitize – assess the quantity without counting!More

Union, Intersection and the Empty Set

Union, Intersection and the Empty Set

Check out this way to see how union and intersection work – using SnackTraps and blocks. Also, how the empty set works with them!More

[50 Word Friday] Math People Think Alike!

This 50 word mini-article is inspired by the coincidence of my post about empty sets coinciding with the Math Dude’s podcast this week.More

Empty Sets – When to Use Curly Brackets

Empty Sets – When to Use Curly Brackets

Sets are intuitive – you have a basket and you put stuff in it. But what about the empty basket? How do you write it? And why is that important how you write it? Here’s a hands on example of the empty sets in your kitchen.More

Why Learning to Subitize Is Important

Why Learning to Subitize Is Important

Learning to subitize is more important than learning to count – and knowing how to subitize comes before learning to count!More

Counting with Ordinal Numbers

Counting with Ordinal Numbers

Ordinal numbers are “1st, 2nd, 3rd, …” but we need these to count items to arrived at the final cardinal numbers. All this fancy math talk – why not make it fun with some colorful bugs!More