# Resources tagged with: Trial and improvement

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### There are 86 results

Broad Topics > Thinking Mathematically > Trial and improvement

### Five Steps to 50

##### Age 5 to 7Challenge Level

Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?

### All Change

##### Age 5 to 7Challenge Level

There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?

### Fifteen Cards

##### Age 7 to 11Challenge Level

Can you use the information to find out which cards I have used?

### Jumping Squares

##### Age 5 to 7Challenge Level

In this problem it is not the squares that jump, you do the jumping! The idea is to go round the track in as few jumps as possible.

### Factor Track

##### Age 7 to 14Challenge Level

Factor track is not a race but a game of skill. The idea is to go round the track in as few moves as possible, keeping to the rules.

### Area and Perimeter

##### Age 7 to 11Challenge Level

What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.

### Inky Cube

##### Age 7 to 14Challenge Level

This cube has ink on each face which leaves marks on paper as it is rolled. Can you work out what is on each face and the route it has taken?

### Strike it Out

##### Age 5 to 11Challenge Level

Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

### 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?

### Two-digit Targets

##### Age 5 to 7Challenge Level

You have a set of the digits from 0 â€“ 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?

### Four-digit Targets

##### Age 7 to 11Challenge Level

You have two sets of the digits 0-9. Can you arrange these in the five boxes to make four-digit numbers as close to the target numbers as possible?

### Treasure Hunt

##### Age 7 to 14Challenge Level

Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?

### Find the Difference

##### Age 5 to 7Challenge Level

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

### Factor-multiple Chains

##### Age 7 to 11Challenge Level

Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?

### The Tall Tower

##### Age 5 to 7Challenge Level

As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

### The Brown Family

##### Age 5 to 7Challenge Level

Use the information about Sally and her brother to find out how many children there are in the Brown family.

##### Age 5 to 7Challenge Level

There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. How many eggs are in each basket?

### Fitted

##### Age 7 to 11Challenge Level

Nine squares with side lengths 1, 4, 7, 8, 9, 10, 14, 15, and 18 cm can be fitted together to form a rectangle. What are the dimensions of the rectangle?

### Cycling Squares

##### Age 7 to 11Challenge Level

Can you make a cycle of pairs that add to make a square number using all the numbers in the box below, once and once only?

### One Wasn't Square

##### Age 7 to 11Challenge Level

Mrs Morgan, the class's teacher, pinned numbers onto the backs of three children. Use the information to find out what the three numbers were.

### Plenty of Pens

##### Age 7 to 11Challenge Level

Amy's mum had given her Â£2.50 to spend. She bought four times as many pens as pencils and was given 40p change. How many of each did she buy?

### Fractions in a Box

##### Age 7 to 11Challenge Level

The discs for this game are kept in a flat square box with a square hole for each. Use the information to find out how many discs of each colour there are in the box.

### Twenty Divided Into Six

##### Age 7 to 11Challenge Level

Katie had a pack of 20 cards numbered from 1 to 20. She arranged the cards into 6 unequal piles where each pile added to the same total. What was the total and how could this be done?

### Make 100

##### Age 7 to 11Challenge Level

Find at least one way to put in some operation signs (+ - x Ã·) to make these digits come to 100.

### Zios and Zepts

##### Age 7 to 11Challenge Level

On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?

### 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?

### What's in a Name?

##### Age 5 to 7Challenge Level

What do you notice about these squares of numbers? What is the same? What is different?

### Highest and Lowest

##### Age 7 to 11Challenge Level

Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.

### Prison Cells

##### Age 7 to 11Challenge Level

There are 78 prisoners in a square cell block of twelve cells. The clever prison warder arranged them so there were 25 along each wall of the prison block. How did he do it?

##### Age 5 to 7Challenge Level

On a farm there were some hens and sheep. Altogether there were 8 heads and 22 feet. How many hens were there?

### Grouping Goodies

##### Age 5 to 7Challenge Level

Pat counts her sweets in different groups and both times she has some left over. How many sweets could she have had?

### The Puzzling Sweet Shop

##### Age 5 to 11Challenge Level

There were chews for 2p, mini eggs for 3p, Chocko bars for 5p and lollypops for 7p in the sweet shop. What could each of the children buy with their money?

### Chain of Changes

##### Age 5 to 7Challenge Level

Arrange the shapes in a line so that you change either colour or shape in the next piece along. Can you find several ways to start with a blue triangle and end with a red circle?

### One Big Triangle

##### Age 5 to 7Challenge Level

Make one big triangle so the numbers that touch on the small triangles add to 10.

### Number Round Up

##### Age 5 to 7Challenge Level

Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

### 4 Dom

##### Age 5 to 16Challenge Level

Use these four dominoes to make a square that has the same number of dots on each side.

### Domino Square

##### Age 7 to 11Challenge Level

Use the 'double-3 down' dominoes to make a square so that each side has eight dots.

### Charitable Pennies

##### Age 7 to 14Challenge Level

Investigate the different ways that fifteen schools could have given money in a charity fundraiser.

### Sticky Dice

##### Age 7 to 11Challenge Level

Throughout these challenges, the touching faces of any adjacent dice must have the same number. Can you find a way of making the total on the top come to each number from 11 to 18 inclusive?

### Dice Stairs

##### Age 7 to 11Challenge Level

Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?

### Strike it Out for Two

##### Age 5 to 11Challenge Level

Strike it Out game for an adult and child. Can you stop your partner from being able to go?

### Escape from the Castle

##### Age 7 to 14Challenge Level

Skippy and Anna are locked in a room in a large castle. The key to that room, and all the other rooms, is a number. The numbers are locked away in a problem. Can you help them to get out?

### Sports Equipment

##### Age 7 to 11Challenge Level

If these balls are put on a line with each ball touching the one in front and the one behind, which arrangement makes the shortest line of balls?

### Well Balanced

##### Age 5 to 18Challenge Level

Exploring balance and centres of mass can be great fun. The resulting structures can seem impossible. Here are some images to encourage you to experiment with non-breakable objects of your own.

### 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?

### Rabbits in the Pen

##### Age 7 to 11Challenge Level

Using the statements, can you work out how many of each type of rabbit there are in these pens?

### Magic Matrix

##### Age 7 to 11Challenge Level

Find out why these matrices are magic. Can you work out how they were made? Can you make your own Magic Matrix?

### Tricky Triangles

##### Age 5 to 7Challenge Level

Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?

### One Million to Seven

##### Age 7 to 11Challenge Level

Start by putting one million (1 000 000) into the display of your calculator. Can you reduce this to 7 using just the 7 key and add, subtract, multiply, divide and equals as many times as you like?

### A Numbered Route

##### Age 7 to 11Challenge Level

Can you draw a continuous line through 16 numbers on this grid so that the total of the numbers you pass through is as high as possible?