Plus, minus, gange og dividere med brøker og brøk med helt tal
https://www.youtube.com/watch?v=7La4ct7q2-c
Division
https://www.youtube.com/watch?v=Uh3Ymfv26sw
https://www.youtube.com/watch?v=9Knby_uYdDE
https://www.youtube.com/watch?v=jS2Opkd6Qxk
https://www.youtube.com/watch?v=ZqbDF0hGEDk
Subtraktion
https://www.youtube.com/watch?v=X23qr4N2q-M
https://www.youtube.com/watch?v=l0KHDp5Wukg
https://www.youtube.com/watch?v=w4ffvrHMA44
https://www.youtube.com/watch?v=a5FifaKS_Wg
Addition
Multiplikation
https://www.youtube.com/watch?v=LFXvkKmMa98
https://www.youtube.com/watch?v=g-rMKD_oqiE
https://www.youtube.com/watch?v=OQ8CNuxgCrg at gange med decimaltal
https://www.youtube.com/watch?v=PYrgjMubh-c
