2. Pedro mixes 3/4 teaspoon of plant food for every gallon of water, and we need to find out how much he needs for 5 gallons.
First, make 5 gallons into a fraction. The easiest fraction to make would be 5/1, so we'll use that.
Now, we multiply the fractions to find out how much he needs. In order to do that, we multiply the numerators (top numbers) together, and we multiply the denominators (bottom numbers) together.
[tex] \frac{3}{4} * \frac{5}{1} [/tex]
3 x 5 = 15
4 x 1 = 4
He needs 15/4 teaspoons of water. We can simplify this by seeing how many times 4 goes into 15.
4 x 3 = 12
4 x 4 =16
16 is bigger than 15, so we can't use that.
12 is 3 less than 15, so we can write the fraction as
3 3/15
Pedro needs 15/4, or 3 3/15 teaspoons for 5 gallons of water. (D)
4. Which of the following expressions is NOT equal to 7/10?
A) 5/10 + 1/10 + 1/10
B) 2/10 + 2/10 + 3/10
C) 3/10 + 3/10 + 2/10
D) 4/10 + 2/10 + 1/10
To find the answer, we simply have to add the fractions together. Any fractions with the same denominator (bottom number) can be added by putting all the numerators (top numbers) together over the denominator.
A) 5/10 + 1/10 + 1/10
5 + 1 + 1 = 7
7/10
B) 2/10 + 2/10 + 3/10
2 + 2 + 3 = 7
7/10
C) 3/10 + 3/10 + 2/10
3 + 3 + 2 = 8
8/10
D) 4/10 + 2/10 + 1/10
4 + 2 + 1 = 7
7/10
C came out to 8/10 which is bigger than 7/10. This means that C is not equal to 7/10.
The answer is C) 3/10 + 3/10 + 2/10
