Teachers can easily make these models using a ruler, such as a 1 metre ruler, and elastic.

This means there is a ratio of blue to white of 1: We can label each scale using the information we are given in the problem. It can then be stretched to the desired length.

This elastic tape measure model was developed by J. Working Out Thinking To find out what percent 7 out of 20 is, we need to ask: We multiply each part of the original ratio by the same number and we can find equivalent ratios.

We may then be able to simplify the fraction further. Each quantity must be measured in the same units. What percent of apples cannot be sold? What percent is 10 of 50? The order in which a ratio is written is very important. To find the answer we line up the zeros of the ruler and the elastic.

An advantage of ratios is that we can compare several things at once. What percent of time did he spend waiting in the queue? To turn this into a percent we are asking, 11 out of 25 minutes equals how many minutes out of minutes? Elastic tape measure model The tape measure model is a good linear model of percent.

In more complicated problems this dual-scale number line is a good way of organising the information we are given and to work out what information we need to find. The right side of the number line has a number scale. If we say the ratio of the number of girls to the number of boys is 5: Thinking The left side of the number line below has a percent scale.

Percent models Dual-scale number line model We can use the dual-scale number line, also called the proportional number line, to illustrate example 1 from above.

What percent is 7 cm of 20 cm? We know that there are 50 apples in total, ie. A ratio can be written in different ways; - in words - the ratio of the number of girls to the number of boys is 5 to 2, and this is the way we say it - using a colon - number of girls: This fact makes ratios very versatile to use in everyday situations.

The intention is NOT to use this model accurately. It is a good way of showing that percent always involves a proportional comparison of something to To say or write 5: The dual-scale number line model is discussed further in the other pages of the Percent, Ratio and Rates topic.

Once we have represented the problem in this way we can write a proportion equation directly from the number line. We know that 30 out of the 50 apples are bruised and we need to find what percent this is. This will make the same colour.

Working Out Thinking Ryan spent 11 minutes out of 25 minutes waiting in a queue. In this case 1 litre of blue to 4 litres of white, making 5 litres of sky blue paint.

The ratios of 1: Working Out Thinking 30 out of 50 apples are bruised. Ryan spent 25 minutes in the bank, 11 minutes of which was spent waiting in a queue. The elastic needs to be marked with a percent scale. Weibe Ratios The ratio of 1:By equivalent fractions we know that 30 out of 50 equals 60 out ofso 60% of the apples are bruised.

We could also say that, Ratio and Rates topic. To say or write 5: 2, for example, has no meaning on its own. Writing ratios. Ratios are a way to compare two or more things.

In this figure there are 5 red tiles and 3 blue tiles. We say the ratios of red tiles to blue tiles is "5 to 3". There are three different ways to write the same ratio: 5 to 3; $\frac{5}{3}$ All three ratios mean that there are 5 reds and 3.

killarney10mile.com1 Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities. 1) 5 out of 10 students know Spanish. I have a few and I want to know how to figure it out: The ratio of boys to girls in a class is 5 to 6.

How many boys at in the class if there is a total of students. I guessed 55 boys and 66 girls? 40% of the 25 students in the class are boys. Write 40% as a fraction? Then find the ratio of girls to boys in the class. 10 of the students.

Jun 22, · The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1.

The total number of students in a class would be 14 + 10 = Then, the fraction of boys in a class is `14/24 = 7/` The fraction of girls in a class is `10/24 = 5/` In other words, the.

Download5 out of 10 students know spanish. write as a ratio

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