Month: November 2013

November 2013 – Month in Review

Post Summary

It is the last day of November — time flies fast indeed. Before the month comes to an end, please take a look at this month’s posts from Mathematics and Multimedia.  Please check if you missed one.

 

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The Math Word Problem Series on Number Problems

High School Mathematics, Problem Solving and Proofs

Below is the Number Word Problem Solving Series among the Math Word Problem Series in Math and Multimedia. In this series, several strategies were discussed on how to solve number problems.

1. How to Solve Number Problems Mentally

2. How to Solve Number Problems Using the Model Method

3. How to Solve Number Problems Using Algebra Part 1

4. How to Solve Number Problems Using Algebra Part 2

5. How to Solve Number Problems Using Algebra Part 3

In the next series, we are going to learn how to solve numbers involving age problems.

If you have questions or comments, please use the comment box below.

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Solving Word Problems in Numbers using Algebra Part 3

High School Algebra, Problem Solving and Proofs

This is the last part of the Solving Number Problems Series. In this post, we are going to solve number problems in disguise, or numbers problems with different contexts. The previous two parts in this series you may want to read are Solving Word Problems in Numbers using Algebra are Part 1 and Part 2.

Example 7

Jack is twice as old as Rose. Two years from now, the sum of their ages is 40. How old are they now?

Solution

This problem is an age problem but it is very similar to number problems.  As stated, there are two points in time: now and 2 years from now.

Now, Jack is twice as old as Rose. That means that if Rose is 15, then Jack is 30. That means that if the age of Jack is 2x, then Rose’s age is x. Therefore, we have the following representation.  » Read more

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