JavaScript, Rounded Number Inaccurate Outcome

test-float.js

const num1 = {min: 1, max: 2, step: 0.1}
const num2 = {min: 1, max: 50, step: 0.25}

num1.val = num1.min
while (num1.val < num1.max) {
  let result1 = num1.val + num1.step
  let frac1 = result1.toString().split('.')[1] || ''
  let adj1 = 0

  if (frac1.length > 10 && frac1.slice(2,4)=='49') {
    adj1 = 0.0000000001
    // console.log(`num1: ${num1.val} + ${num1.step} = ${result1} :::: ${Math.round((result1 + adj1) * 100) / 100} `)
  }

  num1.val = Math.round((result1 + adj1) * 100) / 100

  num2.val = num2.min

  while (num2.val < num2.max) {
    let result2 = num2.val + num2.step
    let frac2 = result2.toString().split('.')[1] || ''
    let adj2 = 0

    if (frac2.length > 10 && frac2.slice(2,4)=='49') {
      adj2 = 0.0000000001
      // console.log(`num2: ${num2.val} + ${num2.step} = ${result2} :::: ${Math.round((result2 + adj2) * 1000) / 1000}`)
    }

    num2.val = Math.round((result2 + adj2) * 100) / 100

    let result = num1.val * num2.val
    let frac = result.toString().split('.')[1] || ''
    let adj = 0

    if (frac.length > 10 && frac.slice(2,4)=='49') {
      adj = 0.0000000001
      let r = Math.round((result) * 100) / 100
      let radj = Math.round((result + adj) * 100) / 100

      console.log(`(num1*num2): ${num1.val} * ${num2.val} = ${result} >> round ${r} ${r==radj? '----' : '****'}  w/adj ${Math.round((result) * 1000) / 1000} >> ${radj}`)
    }
  }
}