1. Estimate the number of peanuts in this jar.
2. A box contains some buttons. Four people estimate the number of buttons in the box. Their estimates were 182, 194, 175 and 196.
One of the estimates was four out, one was two out, one was ten out and the other estimate was seventeen out.
How many buttons were in the box?
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Topics: Starter  Estimating  Problem Solving
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Casio Classwiz CalculatorThere is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a highresolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app). As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols! This calculator has a highperformance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more... 
Teacher, do your students have
access to computers? 

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