Donna travelled from the United States to Germany in 10 hours. She spent 12 percent of her time during the journey reading. How many minutes did she spend reading during the journey?
One hour is equal to 60 minutes. And we know that Donna’s total journey time was 10 hours. This is equal to 600 minutes. As 60 multiplied by 10 equals 600. As Donna spent 12 percent of her time reading, we need to calculate 12 percent of 600. As we have a calculator, there are several ways of doing this. 12 percent as a decimal is equal to 0.12. The word “of” in maths means times or multiply. Therefore, we can multiply 0.12 by 600. This is equal to 72.
12 percent can also be written as a fraction as 12 over 100 or twelve one hundredths. Multiplying this by 600 also gives us an answer of 72. We can see this by cancelling two zeros on the top and zeros on the bottom. This leaves us with 12 multiplied by six which equals 72.
An alternative method would be to use the fact that 10 percent of 600 is equal to 60. One percent of 600 is equal to six. This means that two percent of 600 would be equal to 12 as six multiplied by two is equal to 12. Adding our values for 10 percent and two percent of 600 also gives us an answer of 72 as 60 plus 12 equals 72.
We can, therefore, conclude that Donna spent 72 minutes out of her 10-hour journey reading. As there are 60 minutes in one hour, this is equivalent to one hour and 12 minutes.