Converting Decimal 3.45 to a Mixed Number for 18-Year-Olds

To convert the decimal number 3.45 into a mixed number, follow these steps:

1. Identify the whole number: The whole number part of 3.45 is 3.
2. Convert the decimal part to a fraction: The decimal part is .45. This can be expressed as 45/100.
3. Simplify the fraction: Divide both the numerator and denominator by their greatest common factor, which in this case is 5. So:
• 45 ÷ 5 = 9
• 100 ÷ 5 = 20
4. Thus, .45 can be simplified to 9/20.
5. Combine the whole number and the fraction: Now we can write the mixed number as:
• 3 9/20

So, the decimal 3.45 expressed as a mixed number is 3 9/20.