Ratios

In order to make pancakes for many people, we may need four times the amount, so we will quadruple it.

Allie's foot length was 21 cm, then the mother's foot size was 24 cm

Understand the ratio and use the concept of proportional language to describe the ratio relationship between two quantities. For example, "The ratio of feathers to scorpions in the zoo's household is 2: 1, because there is one for each of the two feathers." Understand the concept of the unit ratio a / b associated with the ticket "" ratio a: b (b ≠ 0), and use proportional language in the context of ratio relationship. For example, "In this formula, there are 3 cups per cup of sugar + 4 cups of sugar and 3/4 cups of flour." "I paid $ 15 for a 15 hamburger, which is 5 dollars per hamburger It is "1

"Adjust" the ratio using 2 multiplication or division. A common type of problem with ratios involves using ratios to scale up or down two numbers. The ratio of all items that multiplies or divides a ratio by the same numerical value is the same as the original scale. Therefore, to scale the ratio, multiply or divide by the scale factor.

Ratios are around us, just comparing the two numbers each day (eg red fondant vs. Yellow Fondant). Scale is a statement that allows you to find unknown ratios from known ratios. With known ratios, I know these two numbers. With an unknown proportion, you only know one of the numbers. To solve the unknown, set the known ratio on one side and the ratio of unknown ratio on the other side, cross multiplication and solve the obtained equation. This method is always valid as long as it properly identifies known ratios and unknown ratios.

In mathematical problems and real life, when comparing the known ratios of the two quantities, if half of the second ratio is given, that proportion can be used to predict another ratio. For example 1/2 = 3 / λ, the known ratio is ½. There are two terms for known proportions. Unknown ratio is 3 /? Because it knows one term it is not another term (so it is not a comparison of the two ratios). I know only one of the two terms in an unknown ratio. But if you set them to scale, you can use that scale to find missing numbers.