Out of 16.1, 1.06, 16.01, 1.16 and 16.61, which is the largest?

a good first step is to look at which number has more numbers to the left of the decimal

16.1 has 2

1.06 has 1

16.01 has 2

1.16 has 1

16.61 has 2

Since three of them have two numbers to the left, you want to see which number starting from the left is the bigger number.

16.1 is 1

16.01 is 1

16.61 is 1

Since they all have 1 as their biggest number to the left you go one place to the right and try again. They all share a 6 this time, so you go over the decimal and do the same. You find that

16.1 is 1

16.01 is 0

16.61 is 6

Since 6 is the biggest of these three numbers, 16.61 is the largest number