| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.54 |
| Score | 0% | 71% |
Find the average of the following numbers: 15, 7, 12, 10.
| 7 | |
| 15 | |
| 8 | |
| 11 |
To find the average of these 4 numbers add them together then divide by 4:
\( \frac{15 + 7 + 12 + 10}{4} \) = \( \frac{44}{4} \) = 11
Which of these numbers is a factor of 20?
| 4 | |
| 21 | |
| 13 | |
| 20 |
The factors of a number are all positive integers that divide evenly into the number. The factors of 20 are 1, 2, 4, 5, 10, 20.
What is the greatest common factor of 44 and 44?
| 17 | |
| 44 | |
| 15 | |
| 26 |
The factors of 44 are [1, 2, 4, 11, 22, 44] and the factors of 44 are [1, 2, 4, 11, 22, 44]. They share 6 factors [1, 2, 4, 11, 22, 44] making 44 the greatest factor 44 and 44 have in common.
What is \( \frac{18\sqrt{16}}{9\sqrt{8}} \)?
| 2 \( \sqrt{\frac{1}{2}} \) | |
| 2 \( \sqrt{2} \) | |
| \(\frac{1}{2}\) \( \sqrt{\frac{1}{2}} \) | |
| \(\frac{1}{2}\) \( \sqrt{2} \) |
To divide terms with radicals, divide the coefficients and radicands separately:
\( \frac{18\sqrt{16}}{9\sqrt{8}} \)
\( \frac{18}{9} \) \( \sqrt{\frac{16}{8}} \)
2 \( \sqrt{2} \)
Which of the following is not a prime number?
9 |
|
5 |
|
2 |
|
7 |
A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.