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on a webpage i have the following:

...

<span class="redbtext">16</span>

...

using javascript i want to change the value in there to say: 100

I do think this is possible, but i cant figure out how

I'm assuming you want a variable so that you can change the value at any time:

<span class="redtext">
<script type="text/javascript">
var num = 100
document.write(num)
</script>
</span>

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