MiniGameNickName

<style>
 .elem {
  display: flex;
  align-items: center;
 }
 .cont {
  text-align: center;
  display: inline-block;
 }
 .sign {
  margin: 0;
  height: 1px;
  border: none;
  background: #000000;
 }
</style>

<div class="elem">
 <div class="cont">1<hr class="sign">777</div> &#160;+&#160;
 <div class="cont">458<hr class="sign">3</div> &#160;&minus;&#160;
 <div class="cont">784<hr class="sign">689</div>
</div>

const decimalPlaces = number => {
  if (number.toString().split(/[\.e]/).length === 1) return 0
  let result
  // @ts-ignore
  number.toString().replace(/[\.e]/, reg => {
    switch (reg) {
      case '.': {
        result = number.toString().split('.')[1].length
        return
      }
      case 'e': {
        result = Math.abs(number.toString().split('e')[1])
        return
      }}})
  return result
}
console.log(decimalPlaces(0.000000000000001)) // 15
console.log(decimalPlaces(17.41452)) // 5
console.log(decimalPlaces(10)) // 0