GCF of 24 and 40

Tuesday, September 10, 2019


How to find the GCF of 24 and 40.
I like to use a factor to find the GCF of 40 and 24.
The GCF is the largest number that divides evenly into two or more numbers.
After finding the prime numbers you just multiply the pairs of prime numbers.

24 = 2 2 2 3
40 =  2 2 2  5

Multiply the pairs of prime numbers.

2 x 2 x 2 = 8
The GCF of 24 and 40  = 8

GCF of 30 and 45





How to find the GCF of 30 and 45.
I like to use a factor to find the GCF of 45 and 30.
The GCF is the largest number that divides evenly into two or more numbers.
After finding the prime numbers you just multiply the pairs of prime numbers.

30 = 2 3 5
45 =    3 5 3

Multiply the pairs of prime numbers.

3 x 5 = 15
The GCF of 30 and 45 = 15

Multiples of 24

Friday, August 23, 2019




The multiples of 24 are as follows,

24,  48,   72, 96,   120, 144,168, 192, 216,  240

264, 288,312,336,360, 384, 408, 432, 456, 480





LCM and GCF of 7 and 8

Wednesday, August 14, 2019



Learn how to use a factor tree and the prime numbers for 7 and 8 in order to find the least common multiple ( LCM ) of 7 and 8 and the GCF or greatest common factor for 8 and 7.

The Least Common Multiple ( LCM ) of 7 and 8 equals 56
The Greatest Common Factor ( GCF ) of 7 and 8 equal 1

All factors of 60 and Multiples of 60

Friday, August 2, 2019


Learn the factors and multiples of 60
I also include the prime factorization of 60 using a factor tree.

Positive Factors of  equal 1,2,3,4,5,6,10,12,15,20,30,60

Multiples of 60 equal 60,120, 180,240,300,360,420,480,540,600

Prime factorization of 60  equals 2,2,3,5

Steps of the Scientific Method in 3 Minutes



The scientific method is a systematic method for solving problems. In this video, I review 6 steps of the scientific method.

Step 1. State the problem in a question
Step. 2 Research
Step 3. State a hypothesis
Step 4. Experiment
Step 5. State results
Step. 6 State your conclusion



Where does the sun rise?

Monday, July 29, 2019


The earth rotates around an imaginary axis in a counterclockwise direction.
This rotation causes our daytime and night time.

If you find a simple globe, turn off the lights, point a flashlight at the globe, and spin it counterclockwise will you will notice the following. As the earth rotates notice how the east coast of Australia moves into the sunlight first, and then notice the last part of Australia to receive sunlight is the west coast.

So in the morning when you look at the sun rising you are looking east.
In the evening when you see the sunset you are looking towards the west.

The sun rises in the east and sets in the west only two times a year in each hemisphere

In the northern hemisphere on March 20, which is the first day of spring also called the vernal equinox the sun rises due east. Moving forward the sun then starts setting more northeast. The sun continues to set a little more northeast each day until June 20 or 21 which is the first day of summer also called the summer solstice.  After the summer solstice, the sun starts setting less to the north until September 22 which is the autumn equinox or the first day of autumn on this day the sun sets due east again.

After this day it will rise a little further southeast until December 21 or 22 which is the first day of winter also called the winter solstice.

After this day it sets a little less south until  March 20, which is the spring equinox.
It takes one year to complete this cycle.

In the southern hemisphere,

  • The first day of spring is September 22
  • The summer solstice is between December 20-22
  • The autumn equinox is March 20 
  • The winter solstice is June 21st


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