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A search of MERLOT materialsCopyright 1997-2015 MERLOT. All rights reserved.Sat, 18 Apr 2015 08:58:22 PDTSat, 18 Apr 2015 08:58:22 PDTMERLOT Search - userId=26018http://www.merlot.org:80/merlot/images/merlot.gif
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4434Old Egyptian Fractions
http://www.merlot.org/merlot/viewMaterial.htm?id=720775
Old Egyptian Fractions at MathCats(Web and android version)Old Egyptian Math Cats knew fractions like 1/2 or 1/4 (one piece of a pie).But to make fractions like 3/4, they had to add pieces of pies like 1/2 + 1/4 = 3/4.Old Egyptian Math cats never repeated the same fraction when adding.They never wrote: 1/4 + 1/4 + 1/4 = 3/4How it works:Choose puzzles from the list on the top. ( * = easier, **** = very hard.)Add 2 or 3 fraction pieces below.After you find one solution, the puzzle is marked "Solved." Can you find more solutions? (Click to see them listed on the bottom.)There's the android version in the mirror site linkMath Cats Balance
http://www.merlot.org/merlot/viewMaterial.htm?id=79352
Balance. To balance a wide range of objects: From electrons to galaxies. Didactical tool. To teach about fractions, and rational numbers.Adding apples and oranges
http://www.merlot.org/merlot/viewMaterial.htm?id=687149
To calculate the value of an apple and an orange from 2 purchases.About mental arithmetic, with a pre-algebra tool introducing the Gaussian elimination.In the mirror site, there's the Android 2.2 (and up) version of this program.Adding apples oranges and pears
http://www.merlot.org/merlot/viewMaterial.htm?id=688991
To calculate the value of apple, orange, pear from 3 purchases.About mental arithmetic, with a pre-algebra tool introducing the Gaussian elimination.Adding apples oranges pears and lemons
http://www.merlot.org/merlot/viewMaterial.htm?id=689015
To calculate the value o apple, orange, pear and lemon from 4 purchases.About mental arithmetic, with a pre-algebra tool introducing the Gaussian elimination.Adding Unit Fractions App for Android
http://www.merlot.org/merlot/viewMaterial.htm?id=917779
The app proposes 21 challenges to overcome.Obtaining the proper fractions listed at the top of the application, adding two or three unit fractions.Each proposed proper faction has a variable number of solutions.And different levels of difficultyYou can not repeat unit fractions with the same value.In the app you'll find a button to delete all the solutions found in the current problem, and to start from scratch.The littlest unit fraction used in this app is 1/28.The program is designed to show the usefulness of the subtraction of fractions in solving such problems.Apples And Oranges 1 Decimal App for Android
http://www.merlot.org/merlot/viewMaterial.htm?id=794866
This application is a basic tool for teaching algebra.Trying to solve a system of linear equations with two equations and two unknown variables. (Two purchases)It contains:. A button that generates new questions (״two new purchases of fruits״).. Two drop-downs to select a solution and a button to verify: The verification button checks the solution, and adds it to the list of the session.You can edit the statements. The program checks if the determinant of the proposed statement is nonzero.. The 5 tools to help resolve the problem:* Tool 1: Gauss-Jordan elimination:The two equations are represented as two purchases of fruits.Contains tools to add one column to another, multiply, divide and change the sign for to get to have one apple on a side and and an orange at the other.The result of the two additions are the values of apple and orange.* Tool 2: Graphic:Contains a graphic frame and 2 drop-downs to find the solution, using the method essay / error.The problem posed is a linear system of equations, so the results must be ever into two lines that intersect.To get the answer, one should find this point.You can also click directly on the chart.The graph is divided by the diagonal.Below the diagonal, apple values are entered, for to get the values of the orange.Above the diagonal, one enters the price of the orange.The meeting point of the two lines is represented by a yellow dot.* Tool 3: Two weighing scales:Shows two weighing balances. On the left, due to its drop-down, which determines the value proposed for apples: results gives the price of oranges in terms of the two equations.The right hand scale gives the results from the proposed price for oranges.When a scale is balanced, gives the results of both the price of the apples and oranges.* Tool 4: Cramer's Rule:This tool solves the problem at once.Contrary to what happens in other tools, here we have to manually enter the data of the problem. The two equations (two purchases) are represented in horizontal rows.If you have not entered data, the tool warns that you can not solve the problem.It can also warn when the determinant is zero:The determinant is zero when the two lines that we saw in the graphical tool, are not crossing. This happens when they are parallel. And the lines are parallel when a purchase (equation) is linear function of the other. (eg 1 A + 2 O =n1 and 2 A + 4 O = n2)The program automatically never generates such problems.* Tool 5: Inverse matrix:The tool represents the terms of the equation automatically and in landscape format (each purchase is a row)The resolution tool there are the terms of the two equations on the left and the identity matrix at right.The objective is to calculate the inverse matrix.This is achieved by operating the rows, until the data from the equations (on the left) become the identity matrix.At this time to the right we have the inverse matrix.The multiplication of the results vector by the inverse matrix gives the solution.This app costs $1.25How much pizza to order? Android app
http://www.merlot.org/merlot/viewMaterial.htm?id=709006
Application on addition of fractions.Working with italian pizzas, improper fractions and mixed fractions.The program raises the problem from a hypothetical party where the guests ask for a specific pizza fraction. Guests can only choose two types of pizza for each party.The program calls for the total amount you end up ordering pizza.In order to solve the most difficult problems is a tool to help solve, finding the common denominator.There is a video as support material: http://youtu.be/TVTzNwDPmLU(Video soundtrack: 'O surdato nnammurato' (written by: Aniello Califano Composer: Enrico Cannio) Voice by: Beniamino Gigli) (In Neapolitan language)This program has a castilian (spanish) version and catalan version in the nummolt site:״Cuanta pizza encargamos?״ & "Quanta pizza encarreguem?״There's a free Android (V2.2 and up) version in the mirror link: (multilingual version: en, ca, es, fr, it)https://play.google.com/store/apps/details?id=nummolt.howmuch.pizzaMath Water Table (former obbliq)
http://www.merlot.org/merlot/viewMaterial.htm?id=78406
Math Water Table is an online liquid simulator. (Former obbliq)To get the area of a limited number of shapes (rectangles and triangles)To verify the area formulas of some limited geometrical shapes.Video help at: http://www.youtube.com/watch?v=ngqFCrkoCAUMWT Ideas: http://www.youtube.com/playlist?list=PLo4AMY8jDHYYPu5WBubdyLqYw5yItT3FeIs useful to explain multiplication and division. The old program is in the mirror link.Ninedigits Workshop
http://www.merlot.org/merlot/viewMaterial.htm?id=697160
The problem proposed by ninedigits is to reorder the numbers from 1 to 9 in a square of 3 * 3 to make the sum of the numbers of the first two rows equal to the bottom row.This program is aimed at reflecting on the addition. The goal is to find results that meet the primary condition. We must be aware that after obtaining a correct result can be achieved more easily results having in mind the properties of the sum.Ninedigits has 336 solutions. If the program could become be easy for some, then the goal would be to find valid solutions in which a lady could travel chess box containing 1 to 9 doing right moves in this chess game piece. According to our analysis, there are three solutions of this type. You can also find the solution, following the same conditions, but with the tower of chess: This combination of conditions is only one solution. The program displays graphically the fact that having these special results.For to switch the numbers between them, you can click on two squares, and they become exchanged. You can also drag a number of other to swap them.There's a version for Android 2.2 and up in the mirror site.