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Questions beginners ask

Short answers to the things that trip everyone up at first, each with a small program to try.

To add two numbers, do I need a Create Value block, or can Tell show the sum? Try it
Why does "5" + 3 show 53, not 8? Try it
My Decision says No, but I typed the right answer! Try it
How do I stop people typing the wrong thing? Try it
Repeat, Repeat While, Count or For Each: which loop should I use? Try it
Should I use Decision or Choose? Try it
My program never stops. What's wrong? Try it
What does "used before it is created" mean? Try it
How do I get a whole number when I divide? Try it
How do I check two things at once? Try it
Why is the first item in a list number 1? Try it
Where is my program saved? Can I use it on another computer?