3. Simplify the following: a) \( 0,8 \times 7+4,5 \times 3 \)

Let's break it down! First, calculate \( 0,8 \times 7 \), which equals \( 5,6 \). Then, calculate \( 4,5 \times 3 \), giving us \( 13,5 \). Now, we can add \( 5,6 + 13,5 \), which results in \( 19,1 \). So, the simplified answer is \( 19,1 \)! Want some math trivia? The decimal system we're so familiar with was developed by Indian mathematicians around the 6th century AD and later spread to the Islamic world and Europe. This system made calculations easier and laid the groundwork for all modern arithmetic! If you're keen on honing your math skills, consider picking up some fun math puzzles or apps designed for various skill levels. Websites like Khan Academy or BrainBashers provide interactive ways to learn and practice while having a blast!