<span class='pups'>1</span>
<span class='pups'>2</span>
<span class='pups'>3</span>
.....
<span class='pups'>3</span>
<span class='pups'>4</span>
<span class='pups'>5</span>
.....
$('.pups').each(function() {
this.innerHTML -= -2;
});
// или
$('.pups').text((i, text) => Number(text) + 2);
// или
document.querySelectorAll('.pups').forEach(n => {
n.innerText = -~-~n.innerText;
});
// или
for (const n of document.getElementsByClassName('pups')) {
n.textContent = parseInt(n.textContent) + 2;
}