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Showing posts from 2015

### Improve math skills of your kids - Learn step-by-step arithmetic from Math games

Math: Unknown - Step-by-step math calculation game for iOS.

Math: Unknown is much more than a math game. It is a step-by-step math calculation game which will teach users how to calculate in the correct order rather than just asking only the final calculated results.

The app consists of four basic arithmetic operations which are addition, subtraction, multiplication and division. In order to get started, users who are new to arithmetic can learn from animated calculation guides showing step-by-step procedures of solving each type of operation. It is also helpful for experienced users as a quick reference.

Generally, addition and subtraction may be difficult for users who just start learning math especially when questions require carrying or borrowing (also called regrouping). The app helps users to visualize the process of carrying and borrowing in the way it will be done on paper. Once users understand how these operations work, they are ready to learn multiplication and division.

For most students, division is considered as the most difficult arithmetic operation to solve. It is a common area of struggle since it requires prior knowledge of both multiplication and subtraction. To help users understand division, the app uses long division to teach all calculation procedures. Relevant multiplication table will be shown beside the question. Users will have to pick a number from the table which go into the dividend. Multiplication of selected number and divisor is automatically calculated, but the users have to do subtraction and drop down the next digit themselves. Learning whole calculation processes will make them master it in no time.

Math: Unknown is a helpful app for students who seriously want to improve arithmetic calculation skills.

### Free Solid Edge 2D Drafting ST7

Siemens provides a free copy of Solid Edge 2D Drafting ST7.
Mechanism design always starts with 2D sketches of linkages. This free software allows users to create sketches with constraints. For example: tangent constraint keeps the cam follower (roller) always touching the cam curve. We can then see how other related linkages move. Variables in the sketch can be linked to Excel. So we can automatically change values of desired variables via VBA code. It also has goal seek function that will change the desired dimension which will give the target value of other dimension. It's very interesting to explore its capability. It will be a great tool for machine designer. We will explore more in later posts.

Download free copy of Solid Edge 2D Drafting ST7