What are the Values of these Chess Pieces?
If each chess symbol represents a different digit from 0 to 9, what are the values of each symbol – ♙, ♘ and ♖?
When You Cut Off A Piece From A 2D Shape, Does The Area And Perimeter Decrease, Increase Or Stay The Same?
It is important to have an intuitive understanding of how these two properties varies when the shape changes. For example, what happens to the Area and Perimeter when you cut off a piece from a 2D Shape?
Sine, Cosine and Tangent in the Four Quadrants
Remember this picture? We used it to remember the signs of the three primary trigonometry ratios – Sine, Cosine and Tangent in the four quadrants. Each letter (of ASTC or CAST) represents the trigonometry function that is positive in each quadrant, e.g. Cosine is positive in the 4th quadrant etc., and All three are positive …
Connecting the Dots
Happy Snowy Halloween! Here in Boston, we just had our first snow of the year yesterday. It feels like Mother Nature is reminding us about the upcoming winter. We would like to take the chance to share some thoughts about “Connections” today. A math lesson should not be questions after questions. It is important …
Online Math Classes
Here’s an email we sent out to our subscribers this week about live online math classes in summer. We’ve received many queries and have since completed several free evaluation sessions over Zoom. Unlike the online membership program for teachers, our small group live lessons are offered from Kindergarten through high school levels. Spaces are still …
Using Ten Frames for Subtraction
Ten frames is a useful visualization tool when kids first learn about numbers and is often used to introduce addition at the kindergarten or pre-school level, but what about subtraction? How should we use properly ten frames for subtraction? Today, we will explain how we use ten frames to build up the number sense required …
New App – Fraction Multiplication Area Model
If you are teaching fraction multiplication using the area model, check out this new app that illustrate the model in operation!
Bar Model – Trim or Add
The bar model is a useful visualization tool to interpret word problems, but there are more than one way to solve the problem after visualizing. Often, we jump straight to the methods we are used to without seeing that another approach might be easier. Take the choice of whether to trim or add for example, …
3 Surprises We Learned About Teaching Online Group Classes
Like most American teachers, we have stopped all physical classes since the COVID-19 crisis shut our schools down. However, thanks to modern technology, we have been teaching all our group classes online for the past two weeks. So far feedback from teachers, students and parents have been positive, and we were able to continue our …
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New Navigation Menu on Pi Day! (Special Offer)
Pi Day Special Offer To celebrate Pi Day, take 31% off any individual membership subscription when you use discount code PIDAY2020 at checkout, or click this direct link. (This weekend only) Just in time for Pi Day 2020! We have streamlined the site structure, and added bread-crumbs for navigation. Hopefully this makes it easier to …