i think that do read large numbers you should look at the place values. From right to left the place values are ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, and so on.
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They break down very large numbers into groups of 3 from right to left thus making them easy to read as for example 30,000,000,000 is thirty billion
To save writing out very large numbers or very small numbers that have lots and lots of noughts.
Add the numbers into one variable as you read them in. But if you prefer, you can read the numbers into an array and then use a loop to add the numbers together.
Palindrome numbers are numbers that read the same backwards and forwards, like 32923
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