Pirmskaitlis

 Pirmskaitlis - naturāls skaitlis, kas dalās tikai at skaitli 1 un pats ar sevi.
Pirmskaitlim ir tieši divi dažādi dalītāji.

http://www.macibuvideo.lv/pirmreizinataji
Eratostena siets:
http://lv.wikipedia.org/wiki/Eratostena_siets


Spēle

Pirmskatlis - prime number
Salikts skaitlis - composite number

 http://www.softschools.com/math/prime_numbers/prime_numbers_up_to_100/

 http://www.sheppardsoftware.com/mathgames/numbers/fruit_shoot_prime.htm

http://www.xpmath.com/forums/arcade.php?do=play&gameid=60

http://www.sheppardsoftware.com/mathgames/monkeydrive/numbers/MDPrimeNumbers.htm 

Skaitļa sadalīšana pirmreizinātājos

http://www.mathplayground.com/factortrees.html

Parastās daļas

 http://illuminations.nctm.org/Activity.aspx?id=3510

 http://nlvm.usu.edu/en/nav/frames_asid_104_g_1_t_1.html?from=topic_t_1.html

 http://nlvm.usu.edu/en/nav/frames_asid_103_g_1_t_1.html?from=topic_t_1.html

http://www.macibuvideo.lv/c/dalas

https://www.youtube.com/watch?v=6wb-8tYRK-U

http://www.homeschoolmath.net/online/factoring.php

Perimetrs

http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/PerimeterShapesShoot.htm

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html

http://www.shodor.org/interactivate/activities/PerimeterExplorer/

http://www.shodor.org/interactivate/activities/AreaExplorer/

http://www.funbrain.com/cgi-bin/poly.cgi?A1=s&A2=0&A15=2&Submit=Start+Digging%21

 Perimetrs, Laukums
http://www.mathplayground.com/area_perimeter.html

http://www.mathplayground.com/PartyDesigner/PartyDesigner.html

Garums, Masa (svars)

http://www.bbc.co.uk/bitesize/ks2/maths/shape_space/measures/play/popup.shtml