Subtraction Table
You can "look up" answers for simple subtraction using this table:
0 1 2 3 4 5 6 7 8 9 10 11 12
0 0
1 1 0
2 2 1 0
3 3 2 1 0
4 4 3 2 1 0
5 5 4 3 2 1 0
6 6 5 4 3 2 1 0
7 7 6 5 4 3 2 1 0
8 8 7 6 5 4 3 2 1 0
9 9 8 7 6 5 4 3 2 1 0
10 10 9 8 7 6 5...
Monday, 21 July 2014
Saturday, 19 July 2014
Who Works Where
Who Works Where Puzzle - Solution
The Puzzle:
Who Works Where
Alex, Betty, Carol, Dan, Earl, Fay, George and Harry are eight employees of an organization
They work in three departments: Personnel, Administration and Marketing with not more than three of them in any department.
Each of them has a different choice of sports from Football, Cricket,...
Thursday, 17 July 2014
Soccer Problem Puzzle
Soccer Problem Puzzle - Solution
The Puzzle:
Soccer Problem
There are 7 boys on a soccer team. Each boy has a different position, jersey number, and height. Find out each person's height, position, and number.
* Justin is the goalie
* The right forward is #10
* The goalie is 6' 4''
* Joe is 6' 1''
* Ryan is right forward
* The person next to Ryan...
Wednesday, 16 July 2014
Gardens Puzzle
Gardens Puzzle - Solution
The Puzzle:
Gardens
Five friends have their gardens next to one another, where they grow three kinds of crops: fruits (apple, pear, nut, cherry), vegetables (carrot, parsley, gourd, onion) and flowers (aster, rose, tulip, lily).
1. They grow 12 different varieties.
2. Everybody grows exactly 4 different varieties
3. Each...
Ships Puzzle
Ships Puzzle - Solution
The Puzzle:
Ships
There are 5 ships in a port:
1. The Greek ship leaves at six and carries coffee.
2. The Ship in the middle has a black chimney.
3. The English ship leaves at nine.
4. The French ship with blue chimney is to the left of a ship that carries coffee.
5. To the right of the ship carrying cocoa is a ship going...
Monday, 14 July 2014
Where Did the Dollar Go
Where Did the Dollar Go ? Puzzle - Solution
The Puzzle:
Where Did the Dollar Go ?
Three friends have a nice meal together, and the bill is $25
The three friends pay $10 each, which the waiter gives to the Cashier
The Cashier hands back $5 to the Waiter
But the Waiter can't split $5 three ways, so he gives the friends one dollar each and keeps 2...
Sunday, 13 July 2014
Open The Safe Puzzle
Open The Safe Puzzle - Solution
The Puzzle:
Open The Safe
Ludwig Bump runs the bank in Mathsville.
You have to help him, though, because he has forgotten the combination number of the safe.
Fortunately, he does remember some things about the number which may help you to help him.
· The number has four digits (eg.1234 or 9876).
· All the digits...
How Old is Granny
How Old is Granny Puzzle - Solution
The Puzzle:
How Old is Granny
Tom asked his Granny how old she was. Rather than giving him a straight answer, she replied:
"I have 6 children, and there are 4 years between each one and the next. I had my first child (your Uncle Peter) when I was 19. Now the youngest one (Your Auntie Jane) is 19 herself. That's...
Saturday, 12 July 2014
Eight eights Puzzle
Eight eights Puzzle - SolutionThe Puzzle:Eight eightsUsing 8 exactly eight times to make a 1000.You can use any mathematical symbolsOur Solution:By Shivani Dixit:888 + 88 + 8 + 8 + 8by Patrick Saunders:(8(8(8+8)-(8+8)/8))-8by Year 10 Set 4 at Lady Manners in Derbyshire:8888/8.888By Daryl S::(888-8) + 8×(8+8) - 8((8×(8+8))-((8+8+8)/8))*8(8+((8+8)/8))^((8+8+8)/8)(8+((8+8)/8))^((88/8)-8)((8×(8+8))-((88/8)-8))×8(8888-888)/8By...
Friday, 11 July 2014
Alphabetical Order
Alphabetical Order Puzzle - SolutionThe Puzzle:Alphabetical OrderFind a number with its letters in alphabetical order.Example: "five" has "fiv" in alphabetical order, but not "e".Our Solution:FortyIt is the only number we know of in English with its letters in alphabetical order. And that is the correct spelling.Examples from other languages:In Spanish...
Sunday, 6 July 2014
A Weighty Problem Puzzle
A Weighty Problem Puzzle - Solution
The Puzzle:
A Weighty Problem
I have ten boxes which I want to pack into crates. Each crate can carry a maximum of 25 kg.
But I only have three crates, and the total weight of the boxes is 75kg:
15 kg, 13kg, 11 kg, 10 kg, 9 kg, 8 kg, 4 kg, 2 kg, 2kg, 1 kg
How can I pack the boxes into the crates?
Our Solution:
Ten...
Saturday, 5 July 2014
5-digit Number Puzzle
5-digit Number Puzzle - SolutionThe Puzzle:5-digit NumberWhat 5-digit number has the following features:If we put the numeral 1 at the beginning, we get a number three times smaller than if we put the numeral 1 at the end of the number.Our Solution:We can make an equation:3(100000 + x) = 10x+1(Why? Well, adding 100000 puts a 1 at the front of a five-digit...
Friday, 4 July 2014
And Mint Sauce Puzzle
And Mint Sauce Puzzle - SolutionThe Puzzle:And Mint SauceSix wolves catch six lambs in six minutes.How many wolves will be needed to catch sixty lambs in sixty minutes?No, the answer is not sixty. Try again!Our Solution:I should also have said that the answer was not 10 either! That is a popular answer, but I'm afraid it is not correct. The right...
Thursday, 3 July 2014
How long will it take to fill the pool using all 4 taps at once
How long will it take to fill the pool using all 4 taps at once?Our Solution:First, work out how much of the pool gets filled by each tap in one hour.The first tap takes 48 hours to fill the pool, so in one hour it fills 1/48 of the poolThe second tap 1/72The third tap 1/96And the fourth tap fills 1/6 of the poolWe need to add all those fractions...
Wednesday, 2 July 2014
Measuring Just 1 Liter Puzzle
Measuring Just 1 Liter Puzzle - Solution
The Puzzle:
Measuring Just 1 Liter
Imagine having three bowls, with the following capacities:
In bowl A (8 liters capacity) are 5 liters of water.
In bowl B (5 liters capacity) are 3 liters of water.
In bowl C (3 liters capacity) are 2 liters of water.
Can you measure exactly 1 liter, pouring only 2 times?
Our...
Sunday, 29 June 2014
Measuring 7 Liters Puzzle - Solution
The
Puzzle:
Jack and Jill did not have much success when they went up the
hill to fetch a pail of water from the well. However, once they had both
tumbled down the other side they found...
Tuesday, 24 June 2014
Measuring 4 Liters
Measuring 4 Liters
You are doing some gardening, and need exactly 4 liters of water to mix up some special formula for your award winning roses.
But you only have a 5-liter and a 3-liter bowl, but do have access to plenty of water.
How would you measure exactly 4 liters?
Our Solution:
Fill the 5-liter bowl. Then fill the 3-liter bowl from the...
Friday, 20 June 2014
Measuring 4 and 4 Litres Puzzle
Measuring 4 and 4 Litres
You are camping, and have an 8-liter bowl which is full of fresh water.
You need to share this water fairly into exactly two portions (4 + 4 liters).
But you only have two empty bowls: a 5-liter and a 3-liter bowl.
Divide the 8 liters in half in as short a time as possible.
Our Solution:
Pour 5 liters from the 8-liter...
Wednesday, 18 June 2014
Measuring 2, 2 and 3 Liters Puzzle
You have three bowls: 7, 4 and 3 liters in capacity.
Only the 7-liter is full.
Pour the fewest times to have the bowls containing 2, 2 and 3 liters.
Our Solution:
Fill the 4-liter from the 7-liter bowl.
Fill the 3-liter from the 4-liter bowl.
You will have 3 liters left in the 7-liter,1 liter in the 4-liter and 3 in the 3-liter bowl. (Let us abbreviate...
Tuesday, 17 June 2014
Measure exactly 2 liters of water
Measure exactly 2 liters of water if you have:1) 4 and 5-liter bowls2) 4 and 3-liter bowlsOur Solution:1) Fill the 5-liter bowl, pour water from it to fill the 4-liter bowl, which you empty afterwards.Pour the remaining 1 liter to the 4-liter bowl.Refill the 5-liter bowl and then carefully pour water from it to fill the 4-liter bowl (where there is...
