# Tag Archives: sets

### 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! Continue Reading →

### 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! Continue Reading →

### [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. Continue Reading →

### 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. Continue Reading →

### 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! Continue Reading →

### 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! Continue Reading →