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Introduction - Money, the Great Motivator__

### A great reason to be careful and knowledgeable with mathematical calculations is that it might cost you money one day. If you're not sure about how to add and subtract 2- or 3-digit numbers, it might cost you 2- or 3-digits worth of cash.

### That was the reason I gave the kids when we launched into a bit of 3-digit subtraction work.

### Money is real. People use it every day. And having 1 dollar coins, 10 dollar notes and 100 dollar notes is a great advantage when working in a base-10 number system. Probably why we don't have $6 notes or 17c coins.

### Though when I was young I did see a 3c coin made by putting a 1c and 2c together on a railway track.

### And blow me down - there was a 3c coin made in the USA from 1851 to 1889!

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Setting Them Up

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Setting Them Up