# Resources tagged with: Working systematically

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### There are 342 results

Broad Topics > Thinking Mathematically > Working systematically

### Watch the Clock

##### Age 7 to 11Challenge Level

During the third hour after midnight the hands on a clock point in the same direction (so one hand is over the top of the other). At what time, to the nearest second, does this happen?

### Home Time

##### Age 7 to 11Challenge Level

Alice's mum needs to go to each child's house just once and then back home again. How many different routes are there? Use the information to find out how long each road is on the route she took.

### Wonky Watches

##### Age 7 to 11Challenge Level

Stuart's watch loses two minutes every hour. Adam's watch gains one minute every hour. Use the information to work out what time (the real time) they arrived at the airport.

### 5 on the Clock

##### Age 7 to 11Challenge Level

On a digital clock showing 24 hour time, over a whole day, how many times does a 5 appear? Is it the same number for a 12 hour clock over a whole day?

### Colour in the Square

##### Age 7 to 16Challenge Level

Can you put the 25 coloured tiles into the 5 x 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?

### Nine-pin Triangles

##### Age 7 to 11Challenge Level

How many different triangles can you make on a circular pegboard that has nine pegs?

### Junior Frogs

##### Age 5 to 11Challenge Level

Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?

### Order the Changes

##### Age 7 to 11Challenge Level

Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?

### First Connect Three

##### Age 7 to 14Challenge Level

Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

### A Child Is Full of ...

##### Age 7 to 11 ShortChallenge Level

My cousin was 24 years old on Friday April 5th in 1974. On what day of the week was she born?

### LOGO Challenge - Triangles-squares-stars

##### Age 11 to 16Challenge Level

Can you recreate these designs? What are the basic units? What movement is required between each unit? Some elegant use of procedures will help - variables not essential.

##### Age 7 to 11Challenge Level

How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?

### More Transformations on a Pegboard

##### Age 7 to 11Challenge Level

Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.

### Arrangements

##### Age 7 to 11Challenge Level

Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?

### Geoboards

##### Age 7 to 11Challenge Level

This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.

### Jigsaw Pieces

##### Age 7 to 11Challenge Level

How will you go about finding all the jigsaw pieces that have one peg and one hole?

### How Many Times?

##### Age 7 to 11Challenge Level

On a digital 24 hour clock, at certain times, all the digits are consecutive. How many times like this are there between midnight and 7 a.m.?

### Putting Two and Two Together

##### Age 7 to 11Challenge Level

In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?

### Calendar Sorting

##### Age 7 to 11Challenge Level

The pages of my calendar have got mixed up. Can you sort them out?

### Square Corners

##### Age 7 to 11Challenge Level

What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?

### Shunting Puzzle

##### Age 7 to 11Challenge Level

Can you shunt the trucks so that the Cattle truck and the Sheep truck change places and the Engine is back on the main line?

### Single Track

##### Age 7 to 11Challenge Level

What is the best way to shunt these carriages so that each train can continue its journey?

### Triangles All Around

##### Age 7 to 11Challenge Level

Can you find all the different triangles on these peg boards, and find their angles?

### A Square of Numbers

##### Age 7 to 11Challenge Level

Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

### Maths Trails

##### Age 7 to 14

The NRICH team are always looking for new ways to engage teachers and pupils in problem solving. Here we explain the thinking behind maths trails.

### Waiting for Blast Off

##### Age 7 to 11Challenge Level

10 space travellers are waiting to board their spaceships. There are two rows of seats in the waiting room. Using the rules, where are they all sitting? Can you find all the possible ways?

### Difference

##### Age 7 to 11Challenge Level

Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.

### Magic Potting Sheds

##### Age 11 to 14Challenge Level

Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?

### Games Related to Nim

##### Age 5 to 16

This article for teachers describes several games, found on the site, all of which have a related structure that can be used to develop the skills of strategic planning.

### More Magic Potting Sheds

##### Age 11 to 14Challenge Level

The number of plants in Mr McGregor's magic potting shed increases overnight. He'd like to put the same number of plants in each of his gardens, planting one garden each day. How can he do it?

### Coded Hundred Square

##### Age 7 to 11Challenge Level

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

### Number Sandwiches

##### Age 7 to 14Challenge Level

Can you arrange the digits 1, 1, 2, 2, 3 and 3 to make a Number Sandwich?

### How Long Does it Take?

##### Age 7 to 11Challenge Level

How long does it take to brush your teeth? Can you find the matching length of time?

### Multiples Grid

##### Age 7 to 11Challenge Level

What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?

##### Age 5 to 11Challenge Level

Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.

### Three Way Mix Up

##### Age 5 to 11Challenge Level

Jack has nine tiles. He put them together to make a square so that two tiles of the same colour were not beside each other. Can you find another way to do it?

### Peg and Pin Boards

##### Age 5 to 11

This article for teachers suggests activities based on pegboards, from pattern generation to finding all possible triangles, for example.

### Palindromic Date

##### Age 7 to 11Challenge Level

What is the date in February 2002 where the 8 digits are palindromic if the date is written in the British way?

### Four Triangles Puzzle

##### Age 5 to 11Challenge Level

Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?

### Display Boards

##### Age 7 to 11Challenge Level

Design an arrangement of display boards in the school hall which fits the requirements of different people.

### Window Frames

##### Age 5 to 14Challenge Level

This task encourages you to investigate the number of edging pieces and panes in different sized windows.

### Open Boxes

##### Age 7 to 11Challenge Level

Can you work out how many cubes were used to make this open box? What size of open box could you make if you had 112 cubes?

### Teddy Town

##### Age 5 to 14Challenge Level

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

### Weights

##### Age 11 to 14Challenge Level

Different combinations of the weights available allow you to make different totals. Which totals can you make?

### Roll These Dice

##### Age 7 to 11Challenge Level

Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?

### Isosceles Triangles

##### Age 11 to 14Challenge Level

Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?

### Tri.'s

##### Age 7 to 11Challenge Level

How many triangles can you make on the 3 by 3 pegboard?

### Folded Number Line

##### Age 7 to 11Challenge Level

When I fold a 0-20 number line, I end up with 'stacks' of numbers on top of each other. These challenges involve varying the length of the number line and investigating the 'stack totals'.

### Twin Corresponding Sudokus II

##### Age 11 to 16Challenge Level

Two sudokus in one. Challenge yourself to make the necessary connections.

### More on Mazes

##### Age 7 to 14

There is a long tradition of creating mazes throughout history and across the world. This article gives details of mazes you can visit and those that you can tackle on paper.