To find the product of $1.15 and 10, Justin can use the method of multiplication directly. However, if he were to think about moving the decimal point, it's important to note that multiplying by 10 means he will increase the value, and thus the decimal point should move to the right.
Since 10 is \(10^1\), he moves the decimal point in 1.15 one place to the right. Therefore, the correct method for Justin is:
He knows that 10 is \(10\) to the power of 1, so he needs to move the decimal point in 1.15 one place to the right.