1. What does PEMDAS stand for?
http://www.flocabulary.com/pemdas/
2. PEMDAS song with examples in the middle of the song
3. PEMDAS STYLE, the way learning should be
4. PRIMARY KRIPTO: combine five number cards using the four arithmetic operations (+, –, ×, ÷) to arrive at a «target» number
http://illuminations.nctm.org/Activity.aspx?id=3569
