In the beginning kids will solve the last two problems from the last lesson that they did not have time.
1. $2 bill
A store owner has only $2 dollar bills. The customer who comes in has only $2 and $5 dollar bills. The items in the store cost $1, $2, $3, $4, $5, $6, $8, and $10. Prove that the customer can buy any of the items in the store and get back correct change.
2. How many children study two foreign languages
There are 25 children in the class. 17 study French, 15 study Spanish. Any student study at least 1 foreign language. How many kids study 2 foreign languages?
3. How many three digits numbers
How many are three digits numbers where all digits are 1 or 2 or 3?
Thursday, April 29, 2010
Thursday, April 15, 2010
Proposal for Math class on April 16
1. 4 balls
There are 4 balls (red, black, and white). There are the same number of red balls as white and black combined together. How many black balls are in the box?
2. 15 balls (red, black, and white).
There are 15, red, black and white balls in the box. There are 7 times more red balls than white balls. How many black balls are in the box?
3. Tommy and Johny
Tommy and Johnny have 15 stamps together. Tommy gave Johnny 2 stamps. How many stamps do they have now?
4. Think a number
I am thinking of a number. If you add 1, subtract 2, multiply the results by 3 and divide it by 4 you get 6. What number am I thinking of?
5. Get a new square
Look at the picture below. What is the smallest number of dots that you can add to the picture in order to get a new square?
Solution: you would need to draw dots described in the problem.
Right away you can come up with the following
But it is not optimal. Let's turn the drawing
Then you can come with the following solution.
6. Connect dots
Starting with the same 9 dots, can you connect all the dots with 4 straight lines without lifting your pencil from the paper?
7. $2 bill
A store owner has only $2 dollar bills. The customer who comes in has only $2 and $5 dollar bills. The items in the store cost $1, $2, $3, $4, $5, $6, $8, and $10. Prove that the customer can buy any of the items in the store and get back correct change.
8. How many children study two foreign languages
There are 25 children in the class. 17 study French, 15 study Spanish. Any student study at least 1 foreign language. How many kids study 2 foreign languages?
There are 4 balls (red, black, and white). There are the same number of red balls as white and black combined together. How many black balls are in the box?
2. 15 balls (red, black, and white).
There are 15, red, black and white balls in the box. There are 7 times more red balls than white balls. How many black balls are in the box?
3. Tommy and Johny
Tommy and Johnny have 15 stamps together. Tommy gave Johnny 2 stamps. How many stamps do they have now?
4. Think a number
I am thinking of a number. If you add 1, subtract 2, multiply the results by 3 and divide it by 4 you get 6. What number am I thinking of?
5. Get a new square
Look at the picture below. What is the smallest number of dots that you can add to the picture in order to get a new square?
Solution: you would need to draw dots described in the problem.
Right away you can come up with the following
But it is not optimal. Let's turn the drawing
Then you can come with the following solution.
6. Connect dots
Starting with the same 9 dots, can you connect all the dots with 4 straight lines without lifting your pencil from the paper?
7. $2 bill
A store owner has only $2 dollar bills. The customer who comes in has only $2 and $5 dollar bills. The items in the store cost $1, $2, $3, $4, $5, $6, $8, and $10. Prove that the customer can buy any of the items in the store and get back correct change.
8. How many children study two foreign languages
There are 25 children in the class. 17 study French, 15 study Spanish. Any student study at least 1 foreign language. How many kids study 2 foreign languages?
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