CAL-C It’s a simply designed calculator, specially for the kids below 8th Std. and also for others who use to perform the normal calculations in their daily life. This app is purely made with the Thunkable default components. No External files or extensions are used. Here is an overview video of this apk.
I suggest you to download the APK and check it by your self and Let me know your views !! Downloading link of aia file is given in the description of this video.
Download APK : CAL-C by Ct tricks