| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.70 |
| Score | 0% | 54% |
What is \( \frac{4}{2} \) + \( \frac{3}{6} \)?
| 2\(\frac{1}{2}\) | |
| 2 \( \frac{8}{14} \) | |
| 2 \( \frac{3}{6} \) | |
| \( \frac{3}{6} \) |
To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 2 are [2, 4, 6, 8, 10, 12, 14, 16, 18, 20] and the first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60]. The first few multiples they share are [6, 12, 18, 24, 30] making 6 the smallest multiple 2 and 6 share.
Next, convert the fractions so each denominator equals the lowest common multiple:
\( \frac{4 x 3}{2 x 3} \) + \( \frac{3 x 1}{6 x 1} \)
\( \frac{12}{6} \) + \( \frac{3}{6} \)
Now, because the fractions share a common denominator, you can add them:
\( \frac{12 + 3}{6} \) = \( \frac{15}{6} \) = 2\(\frac{1}{2}\)
A circular logo is enlarged to fit the lid of a jar. The new diameter is 30% larger than the original. By what percentage has the area of the logo increased?
| 27\(\frac{1}{2}\)% | |
| 22\(\frac{1}{2}\)% | |
| 25% | |
| 15% |
The area of a circle is given by the formula A = πr2 where r is the radius of the circle. The radius of a circle is its diameter divided by two so A = π(\( \frac{d}{2} \))2. If the diameter of the logo increases by 30% the radius (and, consequently, the total area) increases by \( \frac{30\text{%}}{2} \) = 15%
What is \( 2 \)\( \sqrt{50} \) + \( 3 \)\( \sqrt{2} \)
| 5\( \sqrt{50} \) | |
| 6\( \sqrt{50} \) | |
| 13\( \sqrt{2} \) | |
| 6\( \sqrt{25} \) |
To add these radicals together their radicands must be the same:
2\( \sqrt{50} \) + 3\( \sqrt{2} \)
2\( \sqrt{25 \times 2} \) + 3\( \sqrt{2} \)
2\( \sqrt{5^2 \times 2} \) + 3\( \sqrt{2} \)
(2)(5)\( \sqrt{2} \) + 3\( \sqrt{2} \)
10\( \sqrt{2} \) + 3\( \sqrt{2} \)
Now that the radicands are identical, you can add them together:
10\( \sqrt{2} \) + 3\( \sqrt{2} \)The __________ is the smallest positive integer that is a multiple of two or more integers.
least common factor |
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greatest common factor |
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absolute value |
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least common multiple |
The least common multiple (LCM) is the smallest positive integer that is a multiple of two or more integers.
Solve for \( \frac{5!}{4!} \)
| \( \frac{1}{6720} \) | |
| \( \frac{1}{56} \) | |
| 5 | |
| \( \frac{1}{7} \) |
A factorial is the product of an integer and all the positive integers below it. To solve a fraction featuring factorials, expand the factorials and cancel out like numbers:
\( \frac{5!}{4!} \)
\( \frac{5 \times 4 \times 3 \times 2 \times 1}{4 \times 3 \times 2 \times 1} \)
\( \frac{5}{1} \)
5