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Answers to questions B5-B6
a. The students visualized the manipulatives to help them translate the number. They also used the operation of addition. They made a mistake whenthey got to the 1 and chose 100 instead of 125. This was probably because they went back to thinking about the bae ten system.
b. I would remind students of the patterns of five by havin gthem make a place value chart for poweres of five to help them make the conversions. 1 2 3 4
125 25 5 1
a. The students are using mental math. They begin to translate the wrong way and correct themselves but start with 300 instead of 342.
b. I would help them by suggesting a chart like the one above. This would remind them of the powers of five. I would then have them start with 125. I would ask, how many 125 in 300? what is left?, How many 25's in 92? How many left over? ok, 17, how many 5's in 17? How many left? 3, how many ones is that?
3 4 2
125 25 5 1
2 3 3 2
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Received on Mon Jul 25 15:38:02 2005