Measuring Angles with Protractors

We are finishing out our geometry unit by using protractors to determine the measurement of angles. We have really been having fun with protractors!

Here is a website that will walk you through the steps if you need a refresher: 

Steps to Use a Protractor

Kiddos will also need to be able to determine the degree without having a ray line up with the zero line. To do this, you need to skip count from one ray to the other to see the rotation degree. You can also subtract the degrees of the rays from each other (165-40=125 degrees or 140-15=125 degrees). When you are subtracting the degrees you need to be sure to use both outside numbers on the protractor or both inside numbers on the protractor. The angle below would measure at about 125 degrees.

They will also need to be able to draw an angle using a protractor.

Finding the missing angle is also a concept we have worked on. Angle COA is a straight angle and therefore measures 180 degrees. We know that angle BOA measures 44 degrees. We can subtract the known angle from the large angle to determine the missing angle (180 - 44 = 136). Angle COB would measure 136 degrees.

The angles below create a complete circle which measures 360 degrees. To find the missing measure, we need to add the given degrees (25 + 90 + 105 = 220) and subtract it from our total (360-220 = 140). This gives us the missing measure of 140 degrees.

Here are some games where kiddos can practice using a protractor:

Measuring Angles

Measuring Angles with a Protractor

Using a Protractor

Measuring to the Nearest Degree

Please let me know if you have any questions!

Life Cycles

A life cycle is the sequential stages of growth and development that an organism goes through in its lifetime. Organisms undergo observable changes during their life cycle including birth, growth, development, reproduction, and death. Some animals, such as butterflies and beetles, pass through distinctly different life stages during their life cycle. Some plants, such as radishes and lima beans, develop from seeds into small plants that resemble the adult form.

Life Cycle of a plant:

The plant starts life as a seed, which germinates and grows into a plant. The mature plant produces flowers, which are fertilized and produce seeds in a fruit or seedpod. The plant eventually dies, leaving seeds which germinate to produce new plants.

Life cycle of a beetle:

The life cycle of a beetle is known as a complete metamorphosis, meaning it has four very different stages: egg, larval, pupal and adult.

Here are some games to solidify these concepts:

Life Cycles Games

Interactive Sites

Life Cycle of Plants

Butterfly Life Cycle

Classifying Quadrilaterals and Triangles

We have been studying different geometric figures. Our main focus has been on classifying quadrilaterals and triangles.

A quadrilateral is a four-sided polygon with four angles. There are many kinds of quadrilaterals. The five most common types are the parallelogram, the rectangle, the square, the trapezoid, and the rhombus.

Here is how they relate to each other:

We have been looking at triangles based on their angles.

The right triangle has one 90 degree angle and two acute (< 90 degree) angles.

Obtuse triangles have one angle that is greater than 90 degrees. Obtuse triangles have only one obtuse angle.

Acute triangles have NO angles greater than or equal to 90 degrees -- all their angles are less than 90 degrees. Acute triangles have three acute angles.

Ask your kiddo if they can find these different quadrilaterals and triangles in the world around them.

Lines, Rays, and Angles

Our geometry unit is in full swing! Here are some of the vocabulary terms that we use.

A point is an exact position on a plane surface.

A line is a collection of points along a straight path with no end points. 

A line segment is a part of a line that contains every point on the line between its end points. 

A ray is a line with a single end point that goes on and on in one direction.

Parallel Lines are two lines that remain the same distance apart at all times and never intersect.

Perpendicular Lines are two lines that intersect and from right angles. 

Intersecting Lines meet or cross each other.

A figure is symmetric (or has symmetry) if it can be folded on a line to form two equal (congruent) halves that fit on top of each other.

Line of symmetry is the fold line of a symmetrical figure. A figure can have one, many, or no lines of symmetry.

An  angle is the intersection of two rays with a common vertex or endpoint. An angle measures the amount of turn of the rays.

There are four types of angles that we have learned about.

An acute angle is an angle whose measure is less than 90°.

 

A right angle is an angle whose measure is 90°.

 

An obtuse angle is an angle whose measure is more than 90°, but less than 180°.

  

A straight angle is an angle whose measure is 180°.

 

Remember that an angle is named using three letters, where the middle letter corresponds to the vertex of the angle.  The angle below is ∠ABC or ∠CBA.   If it is perfectly clear which angle is being named, an angle may be referred to by its vertex letter alone, such as ∠B.

Here are a couple of fun website that allows you to play around with angles:

Angles

Name that Angle

Check out our angle song:

Angle Song

Watch this video to get a better understanding of the differences between these geometry terms.

Geometry Terms

Here are some ways to practice the geometry terms:

Geometry Term Practice

Lines, line segments, and rays practice

Ask your kiddo to show you the dance moves we came up with for these terms.

Heredity

Heredity is the passing of genetic traits from parent to offspring. This is done through dominant and recessive genes.

Dominant genes are the strongest and are usually labeled with a capital letter - "B" for brown, for instance.

Recessive genes are typically hidden by dominant genes. Label the recessive gene for blue eyes "b" - lowercase.

If you get two dominant genes for eye color - BB - you're a brown-eyed beauty. Inherit a dominant and a recessive gene - Bb - you get the dominant color: brown. When both parents contribute a recessive gene, in this case blue-blue or bb, you've got blue eyes. These examples are all inherited traits.

  

Inherited traits are characteristics that are determined by an organism’s genetics and passed from parent to offspring. This can include eye color, hair color, skin type, height, etc.

Acquired traits, or learned behaviors, are behaviors that are acquired by an organism’s interactions with its environment and /or parents. This can include riding a bike, swimming, drawing, climbing, etc.

Inherited behaviors are behaviors that are instinctive. This includes breathing, smiling, blinking, etc.

Check out this fun game to test your knowledge:

Adaptations, Inherited Traits, Learned Behaviors and Food Chains Jeopardy

Data Representations

We have been learning about three new ways to represent data. We have learned about dot plots, frequency tables, and stem-and-leaf plots.

A dot plot is a graphical display of data using dots. It is very similar to pictographs.

A frequency table is a table that shows a set of numbers/scores and their frequency (how many times each one occurs).

A stem-and-leaf plot is a plot where each data value is split into a "leaf" (usually the last digit) and a "stem" (the other digits). For example "32" is split into "3" (stem) and "2" (leaf). The "stem" values are listed down, and the "leaf" values are listed next to them. This way the "stem" groups the scores and each "leaf" indicates a score within that group.

Here are the basic steps to creating a stem-and-leaf plot:

Here are some videos about these data representations:

Stem and Leaf Plot

Frequency Tables and Dot Plots

Here are some activities that you can do to practice these skills:

Reading Dot Plots and Frequency Tables

Reading Stem and Leaf Plots

Creating Dot Plots

Creating Frequency Tables

Frequency Charts

Please let me know if you have any questions!

Elapsed Time

We have just finished out our unit on measurement. This included calculating elapsed time. Elapsed time is the time that elapses while some event is occurring. We learned a few different strategies to calculate this, including using a number line, a t-chart, mountains, and zoom.

Number Line:

T-Chart:

Mountains, Hills, and Rocks:

Zoom:

Follow this link if you need a video refresher:
Elapsed Time Video

Here are some games to practice elapsed time:

RoboClock

Math Man

Elapsed Time Game

Elapsed Time

Please let me know if you have any questions!