The worker at McDonald's decides to join these slices to make complete Pizzas and sell them. He manages to form 18 Pizzas each having 9 equal slices. The worker at Domino's also decides the same and he also comes up with 18 complete Pizzas, each having 6 equal slices. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?
Learn more. Explaining why cross multiplication works using a pie Ask Question. Asked 3 years, 8 months ago. Active 3 years, 8 months ago. Viewed 3k times. AgentS AgentS Show 1 more comment. Active Oldest Votes. The user specifically asks for "pie" and you give him a cake example. Guy Pies need 6 cuts each, a cake can be done in 3.
Add a comment. Take the first cake, cut it into 6 , and take 2 slices. Chronocidal Chronocidal 5 5 bronze badges. Joonas Ilmavirta Joonas Ilmavirta You can solve a proportion just like any other rational function, if you multiply it by the least common denominator of the fractions and simplify.
However, there's a quicker and cooler shortcut called cross multiplication that works for proportions only. All you do is multiply each numerator by the denominator of the other fraction and set the results equal, as shown in Figure Figure Solution : Since this is a proportion, you can cross multiply to eliminate the fractions.
Nutsthis bad boy isn't factorable, so you'll have to resort either to completing the square or the quadratic formula to get the solution. I usually use the quadratic formula, so it doesn't feel like I memorized it for nothing. You'll end up with a solution of:. No, you cannot cross multiply when adding fractions. Cross multiply only when you need to determine if one fraction is greater than another, or if you are trying to find a missing numerator or denominator in equivalent fractions.
Cross multiply fractions with variables by multiplying opposite numerators and denominators of equivalent fractions, setting the values equal to one another, and solving for the variable. Cross multiplication can be used to answer this question.
First, multiply 17 by To solve this problem, start by cross multiplying. A man has a garden that is 6 feet wide and 9 feet long. He is planning on increasing the width to 9 feet. If he wants to increase the length proportionally, what would be the new length? To solve this problem, first set up proportional fractions. Return to Basic Arithmetic Videos. Study Guides Flashcards Online Courses. Cross Multiplying Fractions. When cross multiplying fractions, the name sort of hints at how this is actually done.
Frequently Asked Questions Q How do you cross multiply fractions? A Cross multiply fractions by multiplying the denominator of one fraction with the numerator of the other fraction and then comparing the two values. Q When do you cross multiply fractions? A Cross multiply fractions when you want to determine if one fraction is greater than another, or if you are looking for a missing numerator or denominator in equivalent fractions.
0コメント