The number data type holds floating-point values. Similar to JavaScript, TypeScript considers all numbers as floating-point values. Declaring and initializing the number data type variable can be done as follows:

let price: number = 101; 

Here, the price variable is declared as number and is assigned the value 101. Number type can hold values such as decimal, binary, hexadecimal, and octal literals, as shown:

let decimal: number = 6; 
let hex: number = 0xf00d; 
let binary: number = 0b1010; 
let octal: number = 0o744;