Engineering Design Process — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
In Grade 3, we builded a paper bridge prototype and tested it with coins.
Corrected: In Grade 3, we built a paper bridge prototype and tested it with coins.
In Grade 3, the past tense of build is built, never builded.
2. Fix the sentence:
Our Grade 3 prototype was more stronger than the first design we tested.
Corrected: Our Grade 3 prototype was stronger than the first design we tested.
In Grade 3 grammar, we say stronger, not more stronger, because -er already compares.
3. Fix the sentence:
The Grade 3 team tested there prototype to see if it could hold weight.
Corrected: The Grade 3 team tested their prototype to see if it could hold weight.
In Grade 3 writing, their shows the team owns the prototype; there names a place.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A first model that Grade 3 engineers build to try out an idea is called a prototype.
A prototype lets Grade 3 engineers test an idea before making a final design.
2. In Grade 3, after building a prototype, we test it to see if it works.
Testing in Grade 3 shows engineers if the prototype solves the problem.
3. Grade 3 engineers write down what happens when they test, called results.
Recording results helps Grade 3 engineers remember what worked and what failed.
4. If a Grade 3 prototype fails the test, engineers can change the design and try again.
Changing the design in Grade 3 is part of learning from each test.
Part C: True or False?
Read each statement. Circle True or False.
1. In Grade 3, a prototype is the very last version of a product that goes to the store.
True False
In Grade 3, a prototype is a first test model, not a finished store product.
2. Grade 3 engineers can build a prototype out of simple materials like paper, tape, and straws.
True False
In Grade 3, cheap materials let engineers quickly test ideas without waste.
3. In Grade 3, if a prototype fails, engineers should throw away the whole project forever.
True False
Grade 3 engineers learn from failure and improve the design instead of quitting.