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Thursday, 26 September 2013

Day 4: A 'lil bit of EVERYTHING! @_@

Let's talk MATHS: Fractions, Subtraction,
Multiplication & Polygons?!
Problem 13: Mind Reading

Step 1: Think of 2 digits & reveal only the 1st
e.g. 2
Step 2: Make a number by putting the 2 digits together e.g. 26
Step 3: Add the 2 digits together 2+6=8
Step 4: Subtract the smaller number from the bigger number e.g.26 - 8 =18 
Prof Yeap guessed the answer correctly for all the examples given by my friends.
How did he do it?
Did he really read their minds?!


Activity:

Reveal the 1st digit to your partner. Ask her to guess the final answer using the steps above. What was the 2nd digit?

 

0 to 9...
So many digits...
Which one did your friend choose?!!!
Was she able to guess the 2nd digit?!!
So how do you get the answer?!!

Easy!!!
 Look for PATTERNS!!!

One of the method is: Take the 1st digit and make it a Ten. Next minus the 1st digit and Taa-Daa... You would have solved it in a matter of few minutes!!!
Example:
50-6= 44
or
80-4=76


Problem 14: Fractions and Subtraction
Activity:

1 bar=1 whole
Q(S):
@ show 3 1/4
@ show 3/14-1/2

Method 1

Divide all the bars into 1/4s
13 - 2
 4    4 
11
 4    which is the same as 2 3/4

Method 2
3 1/4 - 1/2
      31/4
   /   \
11/4     2
  /
from 5
        4 take out 2/4 (1/4+1/4=1/2) remaining 3/4
so 31/4 - 1/2 = 2 3/4

Problem 15: 3 little Pigs


Question:
The 3 little pigs bought 4 pizzas. How would they share the pizzas equally?!

    

Method 1:

4 divide by 3 = 3/3 + 1/3 = 1 1/3

Method 2:

4 divide by 3
12 thirds (12/3) divide by 3 = 4/3 = 1 1/3

so each pig gets:

Problem 16:Multiplication

Activity: How do you find the answer for the multiple rows of bird?


There are a few methods to find out the answer:

Method 1:Count in doubles 

If 2 x 7= 14 
then 4 x7=28> 14+14

Method 2:Subtraction
If 5 x 7= 35
then 4 x 7= 35 - 7 = 28

Problem 17: Polygon on a Geoboard

Have you ever tried making shapes using a geoboard?


Dr Yeap drew a square on the dot paper and then a polygon which has one dot in it. He challenged us to draw other shapes that also has one dot in the polygon. He changelled us to find out how many squares are there in the polygons that we drew.



Can you find which polygon is mine?
Answer: It's the 5th one from the left.
So how many squares are there in the polygon that I drew?
 Just count the number of dots that the polygon is made up with and divide the number of dots by 2, and you will get the answer.....


Example:

Number of dots: 6
6 divide by 2 = 3
Therefore, there will be 3 squares in a polygon.
  
 Quote for the day:



To conclude today's lesson, I found out that
MATHEMATICS is an unique creation!
Enjoy this video!!! :)


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