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Key Stage 3 (Junior Secondary)
>
3.1 Number & Algebra 數與數系
>
Directed Numbers and the Number Line 有向數及數線
>
有向數加減測驗
http://www.geogebratube.org/material/show/id/13681
(
Download GeoGebra file
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http://www.geogebratube.org/material/show/id/13683
(
Download GeoGebra file
)
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