Estimation Challenges!

On Monday 4TJ explored some estimation challenges during their maths sessions.

We began by exploring ‘how many’… How many balls in a cup? How many students at school? How many people in the crows? We focused on our reasoning – explaining our mathematical thinking.

Then things got really challenging. Students had to estimate how many 100s and 1000s on a humongous freckle! Some wonderful strategies were used. This included breaking up the big freckle into parts and estimating how many 100s and 1000s in each section, using the whiteboard or grids in maths books. Some students even estimated the surface area of the big freckle using pi!

This was followed by the tissue estimation challenge, where students had to explore how many tissue boxes would fit into our classroom. Students used practical strategies, like counting out the number of tissue boxes across the three dimensions of the room and others measured the room and compared this with the tissue box measurements.

All in all, some great problem solving happening in 4TJ – particularly with tricky problems like these with no precise answers in sight!

 

Problem Solving in 3F

Today we read a book about a wise man in India who did the king a favour. The king wanted to repay him so the wiseman told him he should give him some rice, starting with one grain and doubling each day for each square on his chessboard. The king didn’t know how much rice this was but was too proud to ask. OOPS. We know this never goes well.

Turns out when you double numbers 64 times they get BIG!

We explored what would happen if the chess board had 25 squares. students used a mix of their own knowledge, addition strategies and calculators to find out that at the end of 25 days the king had given away 16 777 216 grains of rice.

 

Some of the students finished this easily so I challenged them to start exploring how much rice would be owed on the 64th day. One group got a little hooked… I don’t think they did much else today. We got really excited when they hit trillions, then it just kept going! I’m not ashamed to say i had to resort to Google after quadrillion!

 

3/4 Estimation Experts!

The Grade 3/4s cleaned up today, winning ALL four prizes from the Family Maths Night!

Well done Kate, Indi, Izzy and Ella for the most accurate estimates from the Guestimation Station, which included the size of a watermelon, the number of froot loops in a jar, the length of a ribbon and the age of all the teachers from the maths team!

 

Exploring Angles With Digital Technologies

This morning grades 4J and 4T pushed their understanding of angles to another level. The students explored different ways of using angles to manipulate and control various robots and software applications. One learning station the students controlled Sphero robots using the drawing tool inside the Sphero EDU app. The students had to draw various shapes that included an example of either an obtuse, acute, reflex, straight or right angles. At another learning station, the students experimented with Dash robot. Using ‘Blocky’ code similar to Scratch student were able to program the Dash to do various tasks. The students needed to apply their knowledge of angles to so that Dash would make accurate turns. See an example here https://photos.app.goo.gl/rmhSTyPPfV2UVcYD9

Honing in on their directional skills the students were also charged with programming Beebots so that they would arrive at their designated destination. This required the students to think computationally and procedurally. The Ozobots were also popular and these allowed the students to explore various types of angles through drawing.

Finally, the students explored a powerful shape design tool https://www.geogebra.org/graphing?lang=en where they were charged with creating various polygons that included examples of various types of angles mentioned above.

It was an amazing hands-on session that allowed the students to explore their learning of angles through digital technologies.

 

Pot of Gold Maths Game with Grade 1s

This week, Grade 4T joined 1B for a buddy maths session. Students learned a new game called ‘Pot of Gold’. The game enabled students to practise their skills of estimating and subitising, as well as explore probability with 20 sided dice! The Grade 4s enjoyed being leaders during the sessions and supporting the Grade 1s to develop their maths skills.

 

Ordering, naming and measuring angles

 

Today in our geometry lesson in maths, the Rectangles group working with Miss G revisited their learning from the other day and discussed angles.

First we ordered angles from smallest to largest and named them as acute, obtuse, right and straight angles.

Then we learned how to measure angles using a protractor and found out how many degrees each angle was.

We know that if an angle is less than 90 degrees it is called an acute angle; if it is more than 90 degrees and less than 180 degrees it is called an obtuse angle and if it is exactly 180 degrees, it is called a straight angle.

The small group really enjoyed doing more challenging maths, and really lapped up the challenge of measuring angles! Something they sure were proud of!

 

Investigating Fractions

During Maths grade 4T and 4J have been looking at fractions. We have had to make a presentation about equivalent fractions and  fractions that are less than and greater than each other. We also had to make a video from Screen Cast. We videoed it on a Fractions app called Fractions Math Learning Centre.

This is my video:

Skyscraper Puzzles

Today 4T and 3/4B teamed up to work on Skyscraper Puzzles. A bit like a 3D sudoku, students had to use spatial reasoning and teamwork to solve these challenging problems. Some wonderful persistence and problem solving on display!

If you’re interested in finding out more about the puzzles or trying these at home, the templates and explanation can be found here: https://buildingmathematicians.wordpress.com/2017/03/14/skyscraper-templates/

Times tables in maths

Students in 3G and 3F working with Miss G for multiplication yesterday practised their 3,4 or 5 times table in a partner game similar to ‘Get out of my house’. They were super focused and worked well in their pairs to practise their facts. Well done!

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