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diff --git a/6e/Unites/Longueur_fraction/index.rst b/6e/Unites/Longueur_fraction/index.rst
index fce3e2c..30ba1f2 100644
--- a/6e/Unites/Longueur_fraction/index.rst
+++ b/6e/Unites/Longueur_fraction/index.rst
@@ -44,3 +44,4 @@ Pour le bilan, on préparera `des bandes de longueurs <./bilan_differentes_fract
 
 On fait mesurer un même objet aux groupes en leurs donnant différentes unités. Les différentes mesures amèneront la question d'une unité commune: le m pour nous. On pourra en profiter pour parler des autres unités ailleurs dans le monde.
 
+`différentes unités <./differentes_unites.pdf>`_