### Issue #104 Resources Mathematics Advanced and Extension 1 booklets Normanhurst Boys High School coursework booklets. All books updated to their latest version.See also Extension 1 and Extension 2. From data to Viz A decision tree from the type of data to choose the best type of visualisation. Countle Combine the given numbers using addition, subtraction, multiplication and division to reach the target. Concept of Similarity Size interactive questions to develop an understanding of similarity.Could be used as a teacher demonstration or student activity. Similar Figures: Dynamic Illustration The applet dynamically illustrates what it means, by definition, for any 2 triangles to be similar. Trig Master A Geogebra reproduction of the Old Trig Master Resource. Trigonometric ratios in circle and triangle Unit circle illustration the trigonometric ratios, in degrees and radians. Challenge on volume of a cylinder This GeoGebra interactive presents a challenge of cylinders increasing in diameter, filled to different levels. “What is the most filled and the least filled?” Personalised Times Tables and Number Bond Colouring Make times tables and number bond colouring that reveals children’s own names when completed. Choose from addition, subtraction, multiplication, division and more. Graphs and Networks An interactive introductory lesson to graphs and networks. Sum of naturals (Gaussian Sum) An interactive that clearly demonstrates how the sum of naturals formula works. Why 7 is Weird A video describing two divisibility tests for 7, and a recap of the other divisibility rules. Coin Tossing and Probability Deane and Rob discuss the probability involved in coin tossing with two coins. They extend the discussion to the probability of certain dates falling on particular days of the week. Summon magical forest spirits! - Measuring Circles 2 Chris and Will are on another magical adventure as they try to clear vines from emblem circles that will summon magical spirits called wills-o’-the-wisp! Problems with Powers of Two A problem is presented to take distinct integers such that as many pair sums as possible are powers of two.