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    • ianm41

      I don’t know what the shit is on the check but it doesn’t have anything to do with the lesson.  The number line thing is trying to teach kids to back-count in their head. And Jack makes an error in the tens column subtracting 20 instead of 10, i.e. going back ten too far on the number line.  Think word problem: Jack is a cashier at a corner store. A kid gives him $3.16 for snacks that cost $4.27. How much does the kid still owe Jack? Your cash register and card machine are down. Do you write out the calculation, get a calculator, or back-count in your head on an imaginary number line in the time it would take to get pen and paper? Also, the kid’s running out the store now….

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