## Profile

I have a Ph.D. in Chemical Engineering specialized in process optimization. In my full-time job, I have been applying mathematical techniques to solving engineering problems in oil industry for more than 10 years. I know very well what level of understanding students should have in mathematics and science to become successful in their future study and career.

At home, I have been reviewing Singapore math and science textbooks and teaching Singapore curriculum to my kids. I have a strong belief that well-written textbooks and a rigorous curriculum can develop students fundamental understanding of math and science. Besides, I have been developing education iOS apps. Some of my apps are available for download from App Store.

#### Education

Ph.D. Chemical Engineering

## Subjects of Expertise

Pre-Algebra, Algebra 1, Algebra 2, Geometry, Trigonometry, Calculus, Statistics, Chemistry, Physics, Physical Science, Pre-Calculus, Elementary Math (K-6th), Elementary Science (K-6th)

# 7 Tutorials by San Y

## Motion of objects under gravity Posted by: San Y on Apr 02, 2017

Have you wondered why an apple hits the ground when it falls from a tree but why the moon does not hit the earth? In this tutorial, we will look at different types of motion under gravity.

## Algebraic Evaluation of Limits Posted by: San Y on Apr 01, 2017

We are going to use a simple example to explain key concepts in limit.

## Common Denominator in Fraction Addition and Subtraction Posted by: San Y on Mar 29, 2017

In this tutorial, we will use a simple example to illustrate the concept of common denominator in fraction addition/subtraction.

## Principle of Air Conditioning Posted by: San Y on Mar 27, 2017

In this tutorial, we will look at how we can transfer heat from a low temperature region to a high temperature region.

## L’Hospital Rule Posted by: San Y on Mar 25, 2017

Is indeterminate form the only condition we need to check before using L’Hospital Rule?

## Reason for Order of Operations – Part 2 Posted by: San Y on Mar 25, 2017

In this tutorial, we will look at a simple mixed addition and multiplication to illustrate the reason for order of operations from unit perspective.

## Reason for Order of Operations – Part 1 Posted by: San Y on Mar 25, 2017

In this tutorial, we will use a simple mixed addition and multiplication example to illustrate the reason for order of operations

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