a)

Did you know that multiplying decimals is like a tiny dance with numbers? When you multiply by , you’re essentially saying, “Let’s take just a slice of that whole pie!” So, . It’s as if you took 30% of 7, and voilà—there’s your answer!

One common pitfall is forgetting to place the decimal point correctly. After doing the multiplication (which would give you ), remember to count the number of decimal places in your factors. Since has one decimal place, you put the decimal point in to make it . It’s all about that precision!