Square 5’s – A Cool Shortcut

 What is 15 x 15? What is 35 x 35? How about 55 x 55? Let’s look at 45 X 45. The shortcut involves 3 steps. Step 1 – the answer will end in 25. Fact! Step 2 – Add one to the first “4” (to get 5) and multiply it by 4. 4 X 5 … Continue reading →

Cover and Calculate – Simple

The speed/distance/time triangle is a classic math construction. Many other equations follow this format. The key to remembering the placement of the letters is alphabetical order. The key to using the triangle is covering the variable you want to FIND with your finger. If you want to find D(istance), cover it and multiply S(peed) by … Continue reading →