With basic adding, as shown here you can use your fingers.
The sum here is 5+2. On one hand we have 5 fingers and on the other we have 5. So all we need to do is count on 2 from 5 and you're done. Works on more too. Try these:
In this addition sum we see that we have to add 123 and 123. There are two ways of approaching this question, although I will take you through one.
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