Step-by-step explanation:
Statement:
The number 4.9 is greater than 4.09 by 0.81.
This problem can be solved using two methods:
First method: Subtract the small number from the greater one.
![4.9-4.09=0.81](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ox5gwr1uh1141nj279xbyzz3jbqpzr3y56.png)
Second method: Subtract both numbers in any order and take the absolute value:
![1. \ \mid 4.09 - 4.9 \mid = \mid -0.81 \mid =0.81 \\ \\ 2. \ \mid 4.9 - 4.09 \mid = \mid 0.81 \mid =0.81](https://img.qammunity.org/2021/formulas/mathematics/middle-school/wdw2hbehnd34gy42e3ryyq55fqtu3be177.png)