2nd Grade ~ Polygons

This week the second grade students have been working on classifying polygons. Polygons are classified based on the number of sides, angles, and vertices that they have. Below is a list of the different types of polygons that your child has been learning about.

(Note: We have also discussed that a quadrilateral has four sides, but there are some special types of quadrilaterals such as a sqaure, rectagnle, trapezoid, and several others. They do know need to be able to identify each type of quadtilateral at this point. They need to understand that any polygon with four sides is a quadrilateral.)

The video below is one that your child watched about polygons. It shows an example of the differnt types in order for the to see what a regular polygon looks like.

3rd Grade ~ Area of a Rectangle

This week your child has been learning about area. Area is the square units inside a given shape. There are three differnt strategies that your child has learned in order to determine the area of a rectangle. An example of each is show below.

Counting

 

 Area = 6 square units

Adding

  

Area = 3 units + 3 units = 6 square units

Multiplication

Area = 2 x 3 = 6 square units

    

4th Grade ~ Long Division

This week the fourth grade students have been learning how to do long division. This is a difficult concept for many students to learn so your students will be taught several different methods that division can be done and they can choose the method that they understand. If your child understands more than one way and chooses to use a different method for different problems then that is OK. The method they are learning this week is called, "partial quotient."

When we divide we can use our base 10 system to help us determine out quotient. While multiplying by 1, 10, 100 and 1,000 we can easily find large chunks to subtract from the dividend to find the total quotient.

An example is listed below of how the students would divide 384 by 3 using partial quotient.

Using partial quotient your child can determine that 384 divided by 3 equals 128.

5th Grade ~ Divisibility Rules

This week the fifth grade students have been learning the divisibility rules. The rules helps students to know whether or not a number is divisible by by another number without actually dividing the numbers out. The is very helpful for them to use for simplifying fractions, determining the mean of a set a data, measurement conversions and many of other concepts. The rules are listed below with an example of how to apply each one.

Divisibility Rules:

Two

If the last digit is divisible by 2 then the original number is divisible by 2.

Example: 4,368

(Since 8 is divisible by two then 4,368 is divisible by 2.)

Three 

If the sum of the digits is divisible by three then the original number is divisible by 3.

Example: 495

4+9+5 = 18

(Since 18 is divisible by 3 then 495 is divisible by 3.)

Four

If the last two digits are divisible by four then the original number is divisible by 4.

Example: 4,328

(Since 28 is divisible by four then 4,328 is divisible by 4.)

Five

If the last digit is a five or a zero then the number is divisible by 5.

Example: 3,695

(Since the last digit is a 5 then 3,695 is divisible by 5.)

Six

If the number is divisible by two and three then the number is divisible by 6.

Example: 534

Is it divisible by 2? – yes because 4 is divisible by 2

Is it divisible by 3? – yes because 5+3+4=12 and 12 is divisible by 3

… so 534 is divisible by 6

Eight 

If the last three digits are divisible by eight then the original number is divisible by 8.

Example 7,328

(Since 328 is divisible by eight then 7,328 is divisible by 8.)

Nine

If the sum of the digits is divisible by nine then the original number is divisible by 9.

Example: 495

4+9+5 = 18

(Since 18 is divisible by 9 then 495 is divisible by 9.)

Ten

If the last digit is a zero then the number is divisible by 10.

Example: 4,560

(Since the last digit is a 0 then 4,560 is divisible by 10.)

The link, http://www.quia.com/mc/11125.html, is for a website that allows your student to practice matching the divisibility rule with the corresponding number.


The websites below allow for your child to practice applying the divisibility rules.
http://www.mathslice.com/ol_dvsbl.php
http://www.vectorkids.com/vkdivisible.htm