Bridge Built and Budget Balanced! Oh no! The bridge is unstable. Check your measurements! Construction Progress ... Is the answer ... ? ... Or is it ... Excellent engineering! Your bridge spans the river within budget. Not quite! You have a Span of blocks and Cost of . We need Span 8 and Cost <= 12.
When you start measuring with a ruler, which mark should you align with the edge of the object?
This is called the Zero-Point Rule! Starting at 0 ensures your measurement is accurate.
Which unit would you use to measure the length of a long river for a real bridge?
We use meters for long distances and centimeters for small things like pencils or toy bridges!
If your toy bridge is 100 centimeters long, how many meters is that?
Great conversion! 100 centimeters is exactly the same length as 1 meter.
If bridge wood costs $2 for every 10cm, how much does 20cm of wood cost?
Since 20cm is two sets of 10cm, we add $2 + $2 to get $4.
You have a $10 note. The bridge materials cost $7. How much change should the shopkeeper give you?
Subtracting the cost ($7) from your money ($10) leaves you with $3 in change.
Which is worth the most money?
The value of money is determined by the number on the note or coin, not by how big or shiny it is!
Which shape is the strongest for building bridge supports?
Triangles are rigid and don't lose their shape when pushed, making them perfect for bridges!
How many sides does a triangle have?
Tri- means three! A triangle has three sides and three corners.
Why do engineers use triangles in bridges?
While they look nice, the main reason is strength! They distribute weight evenly.
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The Bridge Builder's Challenge: Balancing Length and Cost
EvoClass-MATH001 Lesson 6
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Hoot hoot! Welcome, Master Architects!
We need to build a bridge across the Great River, but we must be precise!
Construction Progress 0%
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To build a bridge that reaches the other side, we must measure in centimeters and meters. Always align the start of the gap with the zero mark on your ruler, not the physical edge, to ensure our bridge is long enough!
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Sub-Topic 1
Precise Measuring
Aligning tools to find the exact distance.
Every centimeter of bridge costs money! We use the Cost Equation—multiplying the length by the price—to find our total. We must count our dollars and cents carefully to make sure we don’t spend more than we have!
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Sub-Topic 2
Budgeting the Build
Calculating costs based on bridge length.
Finally, we need to make sure the bridge doesn't wobble! We use triangles in our design because they are the strongest shape and don't bend easily.
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Sub-Topic 3
Structural Shapes
Why triangles make bridges strong.
Did you know people used to measure with their feet? It was very confusing because everyone has different sized feet! That’s why we use standard centimeters and meters today.
Did you know?
The "Standard Unit" was invented because people used to measure with their feet!
Start Building!
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Mission Complete!

Bridge Built and Budget Balanced!

Mission: Budget Bridge Planner
Build a bridge span! You need a Span of 8 blocks but must keep Cost (Area) ≤ 12.
Span: 0
Cost: 0