Rachel
About
Khan Academy on a Stick
Restas 2
Diferentes formas de ver la resta
Suma y resta de numeros de dos dígitos
Ejemplo: Sumando números de dos dígitos (sin llevar)
Restas 2
Ejemplo: resta de 2 dígitos (sin pedir prestado)
Sumas Nivel 2
Your browser does not support video. Please get the latest version of Google Chrome, Firefox, IE, or Safari. Alternately, you can try the link below if you have VLC or another media player installed.
If the above player doesn't work, you can
try this direct link
.