Math.random() generates a random number between 0 and 0.999...
0.45951762031142884
Math.random() * 10 generates a random number between 0 and 9.999...
4.595176203114288
Math.floor(Math.random() * 10) generates a random whole number between 0 and 9
4
To generate a random number in a different range, multiply Math.random() by a different number.