MathNet 4 Kids Project 2002/2003 
We have partnered with another third grade class to exchange monthly math challenges using email. This project allows us to meet two of our curriculum requirements; identifying and using basic computer communication systems (PA State Standard 3.7.3) and practicing mathematical problem solving and communication (PA State Standard 2.5.3). Math challenges we receive and send will be posted below. We hope you will enjoy trying them with us! 
This page was last updated on: February 6, 2003
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Resource: Math Eduplace Brain Teaser Grades 3/4 
From Mrs. Cheek's Third Grade: Alishia had some of her favorite candies M&M's. Her good friend Rachel knows how much Alishia likes M&M's, so Rachel gave Alishia 10. Alishia wanted to share, so she gave Christian 8 M&M's. Now, Alishia has 22 M&M's. How many M&M's did Alishia have to begin with?

From Mrs. Dingman's Third Grade: Ashley saw this ad in a computer magazine: Come INTERtheNET with us. FREE 10DAY Trial! Get 1 minute of free time the first day, 2 minutes of free time the second day, 4 minutes of free time the third day, 8 minutes of free time the fourth day, 16 minutes on the fifth day, and so on. "What good is 1 minute, 2 minutes, or even 4 minutes of time online?" Ashley wondered. "I would need a lot more time than that to find out how good this service could be!" If Ashley signed up for the 10day trial of Internet service, how many minutes of free time would she get on the 10th day? 
From Mrs. Cheek's Third Grade: Justin, Lacie, McKenzie, Jonathan, and Blythe were in a 100yard race. When the newspaper photographed the runners, Justin had just passed the midway mark, Lacie was 15 yards from the finish, and Jonathan had run 40 yards. Blythe had run twice as far as Jonathan. McKenzie was at the 70yard mark.
Help the photographer identify the runners.
List the runners in order, starting with the runner closest to the finish line.

From Mrs. Dingman's Third Grade:
Larry, Curly, and Moe are training to join a swim team. They all know how to swim, but are really out of practice. They decide to make a schedule for increasing the number of laps they swim in the pool each day. Below are the suggestions for a schedule made by each boy. Please find the pattern used for each plan.
Day 1: Larry, 1 lap; Curly, 2 laps; Moe, 1 lap Day 2: Larry, 2 laps; Curly, 4 laps; Moe, rest Day 3: Larry, 4 laps; Curly, 6 laps; Moe, 6 laps Day 4: Larry, 8 laps; Curly, 8 laps; Moe, rest Day 5: Larry, 16 laps; Curly, 10 laps; Moe, 11 laps
According to each boy's plan, how many laps would each boy be swimming on Day 11? ( HINT: Draw a table showing the number of laps each boy swims each day)

Resource: Renaissance Learning, 2000 
From Mrs. Cheek's Third Grade While walking along the river, you come upon an elf. The elf looks very sad, so you ask what is wrong. It seems that the elf has lost some numbers and needs to find them. He says they are special numbers because they have three things in common. 1. They are all between 300 and 600. 2. The middle digit in each number is odd, and the other digits are even. 3. The sum of the digits in each number is 13. What numbers did the elf lose?

From Mrs. Dingman's Third Grade Brad, Cloe, Davey, Haley, Lee, and Sheena are making cool gocarts for a contest. Unlike most carts, these carts don't all have four wheels. Some have as few as three. Other carts have as many as six wheels. The children used twentyfive wheels in all. How many wheels are on each child's gocart? Use the clues below to help solve the problem.
* Cloe has a triangle shaped cart with a wheel at each corner * Brad and Haley evenly shared the eight wheels that came in one box * Lee used one more wheel than Haley * Sheena's cart is shaped like a rectangle. It has two long sides and two short sides. She put three wheels on each of the long sides of her cart.

Source: Brain Teaser from eduplace.com 
From Mrs. Cheek's Third Grade Cory's family is sending family photographs with letters to friends. The weight of each envelope will require $0.55 postage. They have bought some of each of these different stamps: $0.52 Hubert H. Humphrey stamp $0.32 flag stamp $0.23 Mary Cassat stamp $0.20 bird stamp $0.15 Buffalo Bill Cody stamp $0.03 bird stamp Cory wants each envelope to have exactly $0.55 in postage. He wants to make as many different combinations of stamps as possible. He has room for no more than five stamps on each envelope. What are the different stamp combinations Cory can use on his envelopes?

From Mrs. Dingman's Third Grade Jamie's mom took Jamie, Chris, and Evan out to eat after their soccer game. The menu read: Hot Dog $1.50 Cheeseburger $1.95 Soda $.99 Lemonade $.75 Each child had either a hot dog or a burger and a drink. Chris's meal cost the most. Jamie's meal cost the least. Jamie's mom did not have anything to eat or drink. The bill came to $7.68. What did each child have to eat? What did each meal cost? 
From Mrs. Cheek's Third Grade:

From Mrs. Dingman's Third Grade: There are ten tables in a restaurant. On each table there are eight plates. Each plate has five pieces of bread on it. How many plates were there in all? How many pieces of bread were there in all?
Each plate of bread cost $4.50. How much does all the bread cost?
(written by: Megan T., Matthew, Chelsea, and Frank)

