Mini Minds Hub · Free printable
Paper Bridge Coin Test: Free Printable Worksheet for Year 4
- ForYear 4
- StageKey Stage 2
- CostFree
- FormatPrintable PDF
Paper Bridge Coin Test is a free printable design and technology worksheet for Year 4 (ages 8 to 9). Children fold four paper bridges, stack coins on each one and find out which shape is strongest. They guess first, then test, then record what really happened. Page 2 gives the grown-up notes, help ideas, a stretch task and the answers.
It comes from the Mini Minds Hub, the free library of printables from Jaques of London, the British games and toy company that has been making games for families since 1795. You need paper, coins, some books and a pencil. Print both pages, give page 1 to the child and keep page 2 for yourself. Black and white printing works well.
What is on the sheet
Children fill in a table for four bridges. For each one they write the shape, make a guess rank from 1 (strongest) to 4 (weakest), then test it and record the coins held. Afterwards they give each bridge a real rank. They then draw a bar chart of the results and sketch their strongest bridge. Written questions ask them to compare their guess with the result and explain how shape affects strength.
- Bridge
- Shape
- Guess rank (1 = strongest, 4 = weakest)
- Coins held
- Real rank (1 = most coins)
- Bar chart: coins held by each bridge
- Sketch of my strongest bridge
- Which bridge held the most coins? Was your guess right?
- Which bridge held the fewest? What happened to it?
- Use your chart to explain how shape makes paper stronger.
Setting up the test
Make the gap
Set up two stacks of books 15 cm apart. Make the stacks the same height and check the gap with a ruler. Use the same gap for every bridge, or the results cannot be compared.
Keep the paper the same
Cut every bridge from the same type and size of paper. Only the shape should change from one bridge to the next. Fold neatly and press the folds flat with a finger.
Add coins gently
Use the same coins every time. Place them one at a time in the same spot, such as the middle of the bridge. Stop adding as soon as the bridge gives way.
Agree what counts as failing
Decide before you start. A bridge might fail when it collapses, or when it sags and touches the table. Count the coins it held just before that point and write the number in the table.
Why test bridges made of paper?
Every bridge has to carry a load. The load is the weight of whatever crosses it, plus the weight of the bridge itself. Engineers think about how a bridge is shaped and what it is made from, because both change how much it can carry. Paper is a good material for a classroom test. It is light, cheap and easy to fold into different forms.
Engineers build and test models before they build the real thing, because it is cheaper and safer to find a problem early. This sheet works in the same way. Children make a prediction, run a test and compare the result with their guess. The comparison is the useful part, because it shows whether their thinking matched what happened.
Coins are small, so keep them away from younger children who might put them in their mouths. Build the book stacks low and steady so they cannot topple onto feet. Work on a table or a clear floor space.
Bridge facts
- Beam bridges, arch bridges and suspension bridges are three common types of bridge.
- The weight a bridge has to carry is called its load.
- Tower Bridge in London has sections that lift so tall ships can pass through.
- Engineers often test small models of a design before building the real structure.
- People have been building arch bridges for a very long time, and the Romans built many of them.
Skills and curriculum link
- Fair testing
- Making predictions
- Folding and making
- Recording results in a table
- Drawing a bar chart
- Explaining shape and strength
Ideas to help your child test well
- Change one thing onlyIn a fair test, only the bridge shape changes. The paper, the coins, the gap and the way you add coins stay the same each time.
- Guess before testingAsk your child to rank the bridges by looking and thinking, before any coins go on. Then ask why they ranked them that way.
- Add coins slowlyAdd one coin at a time and count aloud. Rushing makes it hard to know exactly when the bridge gave way.
- Look closely at what happensWatch where each bridge bends or folds as the coins pile up. Those clues help children explain what is going on.
Key words
- Fair testA test where only one thing changes and everything else stays the same.
- PredictionA careful guess about what will happen, made before you test.
- LoadThe weight that a structure has to carry.
- SpanThe distance a bridge has to cross. Here it is the gap between the books.
- RankPutting things in order, such as 1st, 2nd, 3rd and 4th.
- Bar chartA graph that uses bars to show amounts, so you can compare them at a glance.
How to use it
- Print both pages. Page 1 is for your child. Keep page 2, which has the notes and answers.
- Gather the materials: paper, coins, books and a ruler. Set up two stacks of books 15 cm apart.
- Fold the four bridges. Before testing any of them, fill in the guess rank column and talk about the reasons.
- Test each bridge by adding coins one at a time. Write the number held in the table, then fill in the real rank and the bar chart.
- Answer the questions and sketch the strongest bridge. Check with page 2, then come back another day to try a new shape.
Help, stretch and game ideas
If it feels too hard
Work in pairs. One child adds coins gently and the other counts aloud and fills in the table. Test one bridge at a time and write the result straight away. Do the table first and leave the bar chart for a short break.
To stretch confident children
Change one thing, such as the gap width or the number of folds, and predict the new result before testing. Record both results side by side. Then explain which change mattered most and how you know.
Make it a game
Race to build the bridge that holds the most coins. Each player gets the same paper and the same gap. Fold, test and compare. Agree the rules first so every test is fair. The strongest bridge wins.
Mistakes to watch for
Watch forThe bridge fails early because the coins were dropped on, not placed.
Try thisPlace each coin down gently in the same spot. Count aloud so nobody loses track.
Watch forThe bridges are not tested fairly, for example with different paper sizes or different gaps.
Try thisMeasure the gap again and use paper cut to the same size. Ask, "What is the only thing that should change?"
Watch forThe bar chart bars do not match the numbers in the table.
Try thisCheck each bar against its row in the table, one bridge at a time, and point to the number on the side scale.
Talk about it
- Which bridge do you think will be strongest, and why?
- What did you keep the same to make the test fair?
- Were you surprised by any result? What did you expect instead?
- Where did the bridge bend or fold first?
- What would you change about your weakest bridge to improve it?
- Where have you seen a real bridge, and what shape was it?
Take it off the page
Bridge spotting
On a walk, look for bridges, footbridges or small crossings. Talk about what shape they have and what they carry. Draw one when you get home.
Strong spaghetti
Build a small bridge from dry spaghetti and tape across a gap. Test it with light objects such as buttons. Compare it with the paper bridges.
Redesign challenge
Draw a plan for a bridge that could hold more coins than your best one. Label the folds and say why you think it will work.
Who it is for
Parents
Sit with your child for the first bridge, then let them lead. Ask them to guess before they test. Praise careful folding and clear thinking, and talk about surprises without worrying about right or wrong.
Teachers
Use it as a starter or a main task in a lesson on structures. It links to the Key Stage 2 design and technology strand on strengthening structures, and to fair testing. Stacks of books, paper and coins are all you need, and page 2 supports mixed ability groups.
Home educators
Pair this with a walk to spot bridges or a library book about famous structures. Children can repeat the test with new shapes for brothers and sisters. Keep the table and bar chart as a record of how their ideas change.
Where this fits in learning
Before this sheet, children will have handled paper and card, joined materials and talked about how things are made. They will also have met simple tables and bar charts in maths. This activity brings those skills together in one small, practical test.
After it, children can test other structures such as towers, shelters or frames, and explore how different materials behave. They can plan their own fair tests, use more careful measurements and explain their results in more detail. Over time this builds towards designing, making and evaluating products.
Questions parents and teachers ask
- What age is Paper Bridge Coin Test for?
It is written for Year 4 (ages 8 to 9) in Key Stage 2. Younger children can try it with help, and older children can use the stretch idea on page 2 to make the investigation more demanding.
- What do I need to do the test?
You need paper, coins, some books, a ruler and a pencil. Set up two stacks of books 15 cm apart. Use the same coins and the same paper for every bridge so the test stays fair.
- Why does the test need to be fair?
A fair test means only one thing changes, which here is the bridge shape. If the paper, gap or coins also change, you cannot tell what caused the result. Keeping them the same makes the comparison trustworthy.
- What if my child's bridge collapses straight away?
That is a useful result, so write it down. Look at where the bridge bent or folded, then talk about why. Your child can improve the folds and test again, as long as the gap and coins stay the same.
- Is this a screen free activity?
Yes. It needs only paper, coins, books and a pencil, so it works well for quiet time, a rainy day or the school holidays. Children fold, test, record and write by hand.
- Can teachers use it in class?
Yes. Teachers can use it as a starter, a main task, a table activity or homework. It needs no preparation beyond printing and gathering simple materials. Page 2 has help and stretch ideas for mixed ability groups.
- Is it free, and do I need colour printing?
Yes, it is free to print for home and classroom use. No, you do not need colour. It prints well in black and white on plain A4 paper, and you can print it again for brothers, sisters or revision.
Preview the full PDF
Made by Jaques of London, making games for families since 1795. A printable supports classroom learning and does not replace a teacher.