If a circle has the diameter of 8, what is the circumference?
The formula for the circumference is πd. In this case, substitute the "d" with the diameter, which is 8. Then you will have 8π. Multiply 8 times π (3.14) to get your answer: approx. 25.13
Write the following fraction in its lowest terms: 21/30 (twenty-one over thirty)
Step 1: To write a fraction in its lowest terms, we first have to find a number that both the numerator (top number) and the denominator (bottom number) can be divided by. In this case, a good number to choose is 3, since both the top and bottom are divisible by 3. Step 2: Divide the numerator by 3. 21 / 3 = 7 Step 3: Divide the denominator by 3 also. 30 / 3 = 10 Step 4: Determine if both the top and bottom numbers can be reduced any more. In this case, they cannot, so your final answer is 7/10 (seven over ten)
Round the following number to the nearest tenths place: 5.187
First, we need to determine where the tenths place is in this number. The order goes as follows: 5 (whole number), decimal, 1 (tenths place), 8 (hundredths place), 7 (thousandths place). By looking at this number we can see that the 1 is in the tenths place. After determining where the tenths place is, then we need to decide whether it should be rounded up or down. To do this we look at the number that follows the 1, that being the 8. The rule to always go by is this: If the number is 0-4, round down. If it is 5-9, round up. In this instance the number is between 5-9, therefore we should round up. The final solution to this problem is 5.2.