Finding a Part of a Number

Property Finding a decimal part of a number is the same as finding a fraction or percent of a number. The word 'of' means to multiply.

Examples '$0.50$ of $120$ is what number?' translates to the equation $0.50 \times 120 = n$, so $n=60$. '$0.75$ of $60$ is what number?' becomes $0.75 \times 60 = n$, which means $n=45$. '$0.9$ is $0.45$ of what number?' translates to $0.9 = 0.45 \times n$. To solve, you divide: $n = \frac{0.9}{0.45} = 2$.

Explanation Whenever you spot the word 'of' between two numbers, it’s a secret code that means 'multiply!' This little trick helps you translate word problems into math equations. So, when a question asks for '$0.25$ of $80$', you can immediately rewrite it as an equation like $0.25 \times 80 = n$ and solve for the answer.