Sunday, November 13, 2011

Maths: writing fractions

This morning we revised fractions, looking at where the two numbers come from. The board above shows that the denominator (the bottom number) is always the number of equal parts, no matter what colour.


The numerator (top number) means the number of parts that are coloured. On the board above, there are four equal parts, and one of them is coloured. The coloured fraction is one quarter.


The numerator is not always 1. On the board above, two quarters are coloured, and two quarters are white. Four quarters make one whole.


If the numerator and denominator are the same, then the whole shape is coloured. In the example above, two halves are coloured.


Here, the fraction coloured orange is the same as the fraction coloured white. They are both five tenths. Ten tenths make one whole, so five tenths are the same as one half.


In the last example, two thirds are purple, and one third is white. Two thirds and one third make one whole.

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