"REKENEN" My first Math app build with app inventor

Interface "Design"

"Rekenen" is my first app build using  MIT App Inventor 2. I  have build this app as a tool for my daughters to practice calculating faster. It's free for everyone to use ( without adds), but can only be installed on android devices. It has a simple interface, is easy to use and works!

It's an simple app which allows students to practice math. Currently I have two versions. One which generates sums to 20 and the other up to 200.

• When is apps is started, it generates 2 random values, each up to 100. 
• These values must be added and filled in the editor. 
• When pressed on check, which is a large Button with an image of a cat, the answer is verified. 
• If the answer is correct, two new random values are generated to be calculated.
• If the answer is wrong, the text ( wrong answer) is turned into RED and a cat sound ( "meow") is played.

CODE BLOCKS

I will continue to work on the following options and features.

• More sums with additions(+), subtractions (-), multiplications (x) and divisions (/). 
• options to select the range of the sums ex. up to 20 , 100 etc...
• record the time used to calculate the sums
• record progress ( good or bad answers)
• a leader-board (if possible with this tool) with highest scores ( #correct answers # fastest) 

I have used the techniques we have learned during the "design thinking" lessons. Important for me was to make small steps and "fail early". I have tried a lot of different things to understand the building blocks of app inventor tool. That's why I have chosen to start with simple addition sums, get it working and then move to next steps.

or scan

NOTE: 

Anyone installing the app (which is an ".apk" file) will need to change the setting on their phone to allow installation of non-market applications:

To find this setting on versions of Android prior to 4.0, go to "Settings > Applications" and then check the box next to "Unknown Sources". For devices running Android 4.0 or above, go to "Settings > Security" or "Settings > Security & Screen Lock" and then check the box next to "Unknown Sources" and confirm your choice.