Build an expression calculator:
let a = 15
let b = 4
console.log(`${a} + ${b} = ${a + b}`)
console.log(`${a} - ${b} = ${a - b}`)
console.log(`${a} * ${b} = ${a * b}`)
console.log(`${a} / ${b} = ${a / b}`)
console.log(`${a} % ${b} = ${a % b}`)
console.log(`${a} ** ${b} = ${a ** b}`)
Try different values. Notice how division gives decimals and % gives remainders.