In the Czech Republic, Ms. Hoffman uses Czech Koruna to pay for things. She found out that about 20 Czech Koruna = 1 US Dollar. So, to figure out how many dollars something is, she has to find out how many Czech Koruna it is, and then divide by 20. She thought that dividing by 20 was actually a hard thing to do in her head. For example, she thought it was difficult to divide 368 by 20 in her head. But, she finally though of an easier way...
Instead of dividing by 20, she would make it easier. First she would divide by 2 and then she would divide that answer by 10. That was a lot easier to do in her head.
Instead of dividing by 20, she would make it easier. First she would divide by 2 and then she would divide that answer by 10. That was a lot easier to do in her head.
Does her new way make sense? Will she get the right answers? How do you know?
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