Which graphing calculator is user friendly? The short answer is none of them. However, your kid should be exposed to graphing calculators before college; she is likely to need to use on in college. Buy a TI 83 or TI 84. Texas Instruments or TI are the most popular brand for schools and colleges. HP and Casio sell graphing calculators, too. TI had a monopoly with the math textbooks.
Are you shopping for used calculators? Yes, there are several versions. TI 81 or TI 82 are older versions which are similar to TI 83 calculators. TI 81/82 do not have as many features. Skip these. I avoid TI 86, too. The TI 86 is a hybrid of the TI 83 and the TI 85. It had the faults of both and few of the features. Usually, the TI 83 is more affordable. The TI 84 has more apps and connects to Vernier sensors, such as Easy Temp. When you bid on used calculators, check the photos to see if it operates. If there is a blotch on the screen, it means the calculator is on its last legs.
Where can you find instructions for using the TI 84 calculator? I never found the owner’s manual instructive. Texas Instruments has free tutorials; they want you to buy and use their calculators. Math it’s has loads of math tutorials. Try not to pay more than $20 for a used TI 83 or $40 for a TI 84. You can do this!
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