26.10.2012 Views

Breuken optellen en aftrekken

Breuken optellen en aftrekken

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Ongelijknamige breuk<strong>en</strong> <strong>optell<strong>en</strong></strong><br />

Ook met pizza’s kun je dit lat<strong>en</strong> zi<strong>en</strong>:<br />

3_<br />

5<br />

= __ 9<br />

15<br />

2_<br />

3<br />

= __ 10<br />

15<br />

Door allebei de pizza’s in 15 stukk<strong>en</strong> te verdel<strong>en</strong>, zie je dat<br />

3 9 2 10<br />

19<br />

5 = 15 <strong>en</strong> 3 = 15 . Sam<strong>en</strong> zijn ze dus 15 . Sam<strong>en</strong>gevat:<br />

3 2<br />

+<br />

5 3 =

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