What is the difference between a ti-15 and a ti-30 calculator.teacher wants ti-15

Question

can not find ti-15 in stores but the ti-30 is everywhere

Answer 1

"From the kitchen table to the playground, children are intrigued by their world. The TI-15 Explorer™ is a pedagogically sound tool that helps students make connections between classroom learning and real-world situations. The TI-15 Explorer combines the fraction capabilities of the Math Explorer™ with a two-line display, problem solving, place value and more. When the TI-15 Explorer™ is combined with traditional learning tools, it helps students explore their world through investigation and experimentation, and helps develop skills in addition, subtraction, powers, and answer format. "

this is from the TI website.  The Ti 15 is used to help students explore math while the Ti 30 is just to do the math after you know the concepts.  Office Max might have it or you can buy one on the internet.