CLASS 7TH DAY 7
INTRODUCTION
Topics
- Addition
- How Sugary Drink affects our teeth.
- Gomoku
Vedic Math
The addition is essentially the most fundamental operation and adding number 1 to the earlier number generates all the numbers. The Sutra “By one more than the previous one describes the generation of numbers from unity.”
0 + 1 = 1 ,1 + 1 = 2 ,2 + 1 = 3, 3 + 1 = 4, 4 + 1 = 5, 5 + 1 = 6, 6 + 1 = 7, 7 + 1 = 8, 8 + 1 = 9, 9 + 1 = 10……
The Ten Point Circle
The Ten Point circle reflects the pair of numbers whose sum is 10.
1+ 9= 10 and 9+1=10
2 + 8=10 and 8+2=10
3 + 7= 10 and 7+3=10
4 + 6= 10 and 6+4=10
5 + 5=10
All these add to 10, so use these number pairs to make groups of ’10’ when adding numbers.
Remember : There are eight unique groups of three numbers that sum to 10, for example 1 + 2 + 7 = 10.
Task:Find the other seven groups of three numbers summing to 10 as one example given for you?
2 + 3 + 5 = 10
By the deficiency method or completing the whole method
7,8,9 close to 10
17,18,19, are close to 20
27, 28, 29, are close to 30
…………… and so on.
We can use this closeness for addition.
Example : 54 + 16 =?
Solution: We can see that here , 4 and 6 is a pair on a Ten point circle. So, let’s break 54 and 16 as follows
54=50+4
16=10+6
Hence, 54 + 16 = (50 + 4) + (10 + 6)=50 + 10 + 10= 70
Multiple of Ten Rule :
By the deficiency, 59 is 1 short in 60, 77 is 3 short in 80
Example 1 : 68 + 4 =?
Solution: Here we can see that 68 is 2 short 70 (a multiple of 10), So, Let’s break 4 as 2+2
68+4= 68 + 2 + 2 = 70+2 = 72
Example 2 : 38 + 24 =?
Solution: Here you can see that 38 is 2 short in 40, so let’s break 24 as 2+22
38+24= 38 + (2 + 22)= 40 + 22 = 62
Adding a list of numbers
Example 5: 49 + 18 + 1 + 4
Solution: Here 49 is 1 short of 50 and 18 is 2 short of 20. And as we can see 49 + 1 is 50 so we are braking 4 as 2 + 2
49+18+1+4=49 + 18 + 1 + 2 + 2 =(49+1) + 18 + 2 + 2 = 72
Example 1 : 57 + 69 + 24 + 52
Solution: Here 57 is 3 short of 60, 69 is 1 short of 70. So break 24 as 20+3+1.
57+69+24+52= 57+69+(20+3+1)+52 =(57+3)+(69+1)+20+52
=60+70+20+52 =202
General Method: The conventional method in mathematics addition is to calculate from right towards the left. In Vedic mathematics we can do addition from left to right which is more, useful, easier and sometimes quicker.
Add from left to right: This type of method is simple enough to do mentally, we add the first column and increase this by 1 if there’s carry coming over from the second column. Then we tag the last figure of the second column onto this.
Pure Numbers
Single digit numbers i.e. 0, 1, 2, 3…9 are known as pure numbers.
Shudh/Pure method
In the Shudh method for addition we carry only the single digit forward and drop the 1 at the tens place.
- Start adding either from top or bottom, (once decided follow that pattern only)
- Add the digits mentally
- As soon as you come across a two digit number, put a dot in front of that number and carry only the single digit forward for further addition.
- Follow this to the end.
- In the end write down the single digit, that you have in the end.
- Now, to have the first digit, count the dots and write it in front of the single digit.
Two or three digit numbers list
Example: Add 234, 658, 818 and 46
Start from the bottom of the rightmost columns and get a single digit 6 on the unit place. There are two dots so we add two to the first number (4) of the second column and proceed as earlier. The one dot of this column is added to the subsequent and ultimately we simply put 1 down (for one dot) as the primary digit of the answer.
Number Splitting Method
Quick mental calculations could be carried out extra simply if the numbers are ‘split into more manageable parts’.
Tip: Think about the best place to keep the split line. It’s best to avoid the carry over the split up lines.
Here is a small quiz to test your understanding. Try to attempt all the questions and get the highest marks possible.👇 👇
How Sugary Drink affects our teeth?
Ever thought of why our elders always say “Beta jayda meetha mut khayo teeth kharab ho jayenge”, “Beta cold drinks mut piyo”. Today, we will explore how the sugary drinks affect our teeth and how brushing our teeth helps to improve the condition. So let’s get started with the activity.
Procedure:
1. Take a mug and fill the coke in the mug.
2. Now gently lower the egg in the mug filled with coke.
3. Let the egg inside the mug for about 24 hours/overnight.
4. After you left the mug for 24 hours, take out the egg from the mug.
5. Observe the texture of the egg after it is kept in coke for 24 hours.
6. Now, take a toothbrush and rub the surface of the egg with this toothbrush and observe what happens.
7. Now take out toothpaste and use it and toothbrush to clean the egg and rinse with water, just like we clean our teeth.
8. Observe how much of the stain can be removed from the egg and how much is left.
To access the video for this experiment follow the link.👇 👇
Reason:
Firstly, let us understand why we have taken eggs?
This is because the composition of egg shells is similar to our teeth.Both eggshells and teeth are made of calcium, a hard white substance that also makes up our bones. So , the outcomes of this activity would be the same as that when done on actual teeth.
Now let us understand why this happens?
The hard shell of an egg protects the delicate parts inside, similar to the hard enamel in your tooth protects the soft and tender pulp. Sugar and acids are very harmful to teeth. Acids actually dissolve the enamel, giving bacteria an inroad to start decaying it, and sugar promotes decay (cavities).
Note, you may observe that it takes a lot longer than you think to clear away the stain, and you will probably find that a lot of the stain is permanent.
GAME TIME
Gomoku, also called Five in a Row, is an abstract strategy board game. It is traditionally played with Go pieces (black and white stones) on a Go board. It can be played using the 15×15 board[1] or the 19×19 board[2]. Because pieces are typically not moved or removed from the board, Gomoku may also be played as a paper-and-pencil game. The game is known in several countries under different names. Players alternate turns placing a stone of their color on an empty intersection. The winner is the first player to form an unbroken chain of five stones horizontally, vertically, or diagonally.
To know more about the game👇 👇
