Math problems - 2nd grade Nov. 28 2012

Math Problems:

11/28/2012

Problem 1

Each row of *s has two more *s than the row immediately above it, as shown. How many *s are contained in row #20?

*
***
*****
*******

Problem 2

Roni starts with the number 5 and counts by 8s. This results in the sequence:
5, 13, 21, 29, 37, and so on. What is the fifteenth number in the sequence?

Problem 3


In the USA, the symbol 5/2 means the 5th month, 2nd day, or May 2. But in England, 5/2 means the fifth day, 2nd month, or February 5. How many days of the year each have the same symbol in both the USA and England?

Problem 4

The length of the room is 20 ft. The snail moves from one side of the room to another. During the day the snail moves 2 ft towards the end of the room, but during the night the snail moves back 1 ft. In how many days will the snail reach the end of the room?



Problem 5

Two tourists were making sandwiches. Third tourist came, and the first two tourists gave him something to eat: the first gave him 3 sandwiches, and the second 2 sandwiches. The third tourist paid them $10. How do the first two tourists need to divide money among themselves?

Problem 6

Here is the sequence: 2, 20, 40, 400, 800. Continue the sequence.

Problem 7

Interesting square
Imagine the square 3 x 3 (9 cells all together). Put numbers from 1 to 9 in such a way that one number should be in one cell, a number is not repeated, sum of the numbers that reside on the same level horizontally, vertically, and diagonally is the same.





Problem 8

Cleaning windows
6 workers clean 6 windows within 6 minutes. What is the minimal number of workers needed to clean 100 windows within 100 minutes?





Problem 9

Treasure hunters
2 treasure hunters found treasure. They don't have any means to measure that. How to divide the treasure between those two treasure hunters in most fair fashion?

Problem 10


September 1 2001 was Saturday. What day of the week was October 1 2001?

Problem 11


There is a 10 stories building. The entrance to the building is on the first floor. 1 person lives on the first floor, 2 people on the second, ..., 10 people live on the 10th floor.
Where (on what floor) does the elevator stop more?

Problem 12


We know that February 1 1996 was Thursday. What day of the week was March 1 1996?



Problem 13


There are 15 cats, 8 of them are black and 8 of them like to eat salmon. How many cats are black and like to eat salmon?

Problem 14

The gnome separated his treasure into 3 different chests, each different color, each standing by the wall. One chest had precious stones, one chest had gold coins, and one chest had magic books. He remembers that red chest is to the right of the one with the stone. And books are to the right of the red chest. What chest contains books, if green chest is to the left of the blue chest?

Problem 15

There are 17 trucks and cars in the garage. Trucks have 6 wheels and cars have 4 wheels. How many of each type are in the garage if the total number of wheels is 82?

Math problems May 18 2012

Problem #1

Calculate 2004 - 2003 + 2002 - 2001 + 2000 - 1999 + ... + 2 - 1

Problem # 2
To print page numbers in a book we need 204 digits. How many pages in this book if we start with page 1?
Problem #3
In the appartments A, B, and C there are 3 cats: white, black and red. In appartments A and B there is not black cat. White cat is not in appartment A? Where is each cat?
Problem # 4
Cut rectangular in 3 triangulars in a such way so that only one of them has right angle.
Problem #5
From the number 12345678910111213…5657585960 cut 100 digits so the resulting number is largest one.
Problem #6
There are two sand watches: for 3 and 7 minutes. An egg can be boiled within 11 minutes. How to measure it using these sand watches?

Math problems for April 27 2012

Problem #1
Perimeter of the square is 12 sq. feet. What is the area if this square?
Problem #2
Anna walked 2 km for 31 minutes. Jane walked 2 km for 1 hour. Who has the higher speed and why?
Problem #3
In the following equation place parenthesis and arithmetic operators.
7_7_7_7 = 8
Problem #4
There are 4 kids in the family. We know that they are 5, 8, 13, and 15 years old. Their names are Kate, Jack, Wendy, and Melissa. One girl goes to nursery school. Kate is older than Jack. If you add ages for Kate and Wendy then the result is divisible by 3. How old are they?
Problem #5
How to get '2' using three '5's?
Problem #6
3 girls (Jane, Lynn, and Sonya) started eating candies. Jane and Lynn ate 11 candies. Jane and Sonya - 14, Lynn and Sonya - 15. How many candies all these girls ate?
Problem #7
How many minutes in 7/10 of an hour?

Math problems for Apr. 13 2012

Problem #1


What is larger? Half of the half of 20 OR quarter of quarter of 80?


Problem #2


The length of the fence is 20 meters. How many poles in this fence if the distance between poles is 2 meters? Poles are in the beginning and the end of the fence.


Problem #3


There is a cave where you can find treasure. This cave has a door. To open this door you need to enter secret code.

_ _ / _ = _ - _ = _ + _ = _ x _


Secret code consists of 9 different digits (1,2,3,4,5,6,7,8,9) instead of each _ , each digit should not be repeated. What is the secret code?


Problem #4


A school received 300 lbs of vegetables (potatoes, carrots, onions). There are 230 lbs of potatoes and carrots. There are 200 lbs of potatoes and onions. How much potatoes, carrots, and onions separately?


Problem #5


Joe drove 160 miles with the speed of 80 miles per hour. He stopped several times. How much time did Joe spend in this trip if all stops took 25 minutes?

Problem #6


A chair and a table cost $250. 4 chairs and 3 tables cost $887. What are the prices of a chair and a table separately?

Problem #7


What is A? 9A/1A = A

Math Problems Feb. 9 2012

Problem #1 - 2/3/3A


N is a number such that

1 x 2 x 3 x 4 x 5 x 6 x 7 = 8 x 9 x N


What is the value of N?


Problem #2 - 2/3/3B


What number between 121 and 149 is exactly divisible by both 3 and 5?


Problem #3 - 2/3/3C


Rachel left home for school at 7:45 one morning. She returned home at 4:05 that afternoon. How many hours and minutes was she gone?
(The number of minutes in your answer must be less than 60)


Problem #4 - 2/3/3D


The area of a square is 36 square centimeters. A rectangle has the same perimteter as the square. The length of the rectangle is twice its width. What is the area of the rectangle is square cm?


Problem #5 - 2/4/4E


Maria writes the same whole number instead of '?' below and gets a true statement. Jon doeas the same as Maria and also gets a true statement. But Jon and Maria choose diferent numbers. What two numbers do they choose?


12 + ( ? x ? ) - ( 7 x ? ) = 0


Problem #6 - 2/5/5E


Alexandra gives 1/2 of her marbles to Tyler, who gives 2/3 of what he receives to Jan, who gives 3/4 of what she receives to Jerry. If each has a counting number of marbles, what is the fewest numbers of marbles that Alexandra could have started with?

Math problems for January 26 2012

Problem #1


What is the value of the whole number N, if


N = 1/2 of 2/3 of 3/4 of 4/5 of 100?


Problem #2


Ana divides the number N by 8 correctly and gets .25 as her answer. Barney multiplies the same number N by 8. What answer should he get?


Problem #3


At a special sale, all shirts sell at one price and all caps sell at another price. Kathy pays $30 for 3 shirts and 2 caps. Marc pays $23 for 1 shirt and 5 caps. For how many dollars does each shirt sell?



Problem #4


At the Math Store each circle costs one amount and each square costs another amount. Five circles plus one square cost 20 cents. Two circles plus three squares cost 21 cents. At these prices, how many cents does twelve circles plus five squares cost?


Problem #5


Every person in a room shakes hands with each other person in the room exactly once. There are total of 15 handshakes. How many people are in the room?


Problem #6
Each row of *s has two more *s than the row immediately above it, as shown. Altogether, how many *s are contained in the first twenty rows?


*


***


*****


*******


Problem #7


Maria writes the same whole number instead of ? and get a true statement. Jon does the same as Maria and also gets a true statementon and Maria choose different numbers. What two numbers do they choose?


12 + (? x ?) - (7 x ?) = 0

Math problems for Jan. 6 2012

Problem #1 - Book 2/Set1/1E


Ben and Jerry start with the same number of trading cards. After Ben gives 12 of his cards to Jerry, Jerry then has two times as many cards as Ben does. How many cards did Ben have at the start?


Problem #2 - Book 2/Set1/2E


Admission to the local movie theater is $3 for each child and $7 for each adult. A group of 12 people pay $64 admission. How many children in this group?


Problem #3 - Book 2/Set1/4E


At a special sale, all pens are sold at one price and all pencils at another price. If 3 pens and 2 pencils are sold for 47 cents, while 2 pens and 3 pencils are sold for 38 cents, what is the cost of a set of one pen and one pencil, in cents?


Problem #4 - Book 2/Set 2/1E


The average weight of a group of children is 100 pounds. Todd, who weighs 112 pounds, then joins the group. This raises the average weight of the group to 102 pounds. How many children were in the original group?


Problem #5 - Book 2/Set 1/1A


What is the value of the following, in simplest terms?


(20 x 24 x 28 x 32) / (10 x 12 x 14 x 16)


Problem #6 - Book 2/ Set 1/1B


Roni starts with the number 5 and counts by 8s. This results in the sequence


5, 13, 21, 29, 37, and so on. What is the twenty-fifth number in the sequence?


Problem #7 - Book 2/ Set 1/1D
A represents a counting number. Find the value of A if

(A + A)/(A x A) = 1/3