Welcome to Science Lesson Resources for Teachers and Parents!

You shall know that: +*+ = + +*-  = - -*+  = - -*-  = + But why? Here is a real-life example. Video: Prove that Negative Times Negative Gives Positive (youtube.com) Example 1: + +  Let's say you gain 2 dollars every day - the coefficient is  +2 How much the amount of money that you have would change in 3 days? - the number of days is +3 So the amount of money you earned in +3 days with +2 each day is 3*2 = +6 dollars   Example 2: - + How much money did you have 3 days ago comparing to now? -3 days  -3 days, times +2 dollars per day, -3*2 = -6 dollars Example 3: - - You spend 2 dollars each day - the coefficient is -2 How much money, comparing to now, you had 2 days ago? -2 days -2 dollars per day * -2 days ago, -2*-2 = +4 dollars 

 Do you know these objects - how to use them, why do we need them, and what to call them in English? Pan Pot Wok Plate Bowl Cup Mug Jug Clay pot 1. Form groups of 4 people 2. Each group thinks of as many as possible words, similar to these 3. You write them down on your poster in a big nice font 4. Each student in the group takes one A4 paper, choses one object from the list, and draws it schematically. Reveal each drawing during the group presentation - it shall be fun.