## The Shapes of Numbers — Exploring Prime Numbers through Eratosthenes’ Sieve

The sieve of Eratosthenes is one of my favorite math exercises to do with kids, and it’s a great intro into prime numbers. It eliminates numbers through the multiples, leaving primes on the 100 chart. We usually use block crayons, because there is a definite pattern on the 100 chart for multiples, and block crayons…

## Fractions-Circles

This is a math series follows our unit for introduction to fractions in grade 3.  This is one of several, and I’m combining several days into one post. This part of the unit all involves circles. Day 1 We opened our fractions unit with cutting circles. I precut 8 different colors of circles, 3 of…

## Patterns in the Multiplication Chart

*A note about the numbers.  In this piece to try to keep things clear, when I speak of the multiples or a particular number, I am writing the numeric symbol for the number i.e. “9.” If I am not talking about the number but describing an amount, I am spelling it out i.e. “three…

## Making a 100 Chart for Math

I adore Grimm’s Counting with Wooden Number Chart, but I couldn’t move past the \$140 sticker price, though I think it’s well worth it. Still I really wanted a 100 chart like this, because we will be using the 100 chart a lot this coming school year for my youngest. I wanted something “whole brained”…