Machines That Changed American Work is a free printable Grade 3 to Grade 5 social studies worksheet on how inventions raised productivity, and what might come next, aligned to C3 Framework indicator D2.Eco.13.3-5. It prints 3 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.
Set 19 of 25 · the same problems every time you open this link.
Set 1 has all 25 in a single PDF. All 25 sets ask different questions.
Machines That Changed American Work
D2.Eco.13.3-5
NameDate
Draw a line from each invention to what it changed. Then write your prediction.
1.Draw a line from each one to its match.
Refrigerated railroad car, 1870s
Mechanical reaper, Cyrus McCormick, 1831
Light bulb, Thomas Edison, 1879
Cotton gin, Eli Whitney, 1793
A.Cleaned cotton fast, which led planters to enslave even more people
B.Carried fresh meat across the country without spoiling
C.Let factories and homes keep working after dark
D.Harvested wheat many times faster than by hand
2.Draw a line from each one to its match.
Barbed wire, Joseph Glidden, 1874
Airplane, Wright brothers, 1903
Personal computer, 1970s
Telegraph, Samuel Morse, 1844
A.Carried people and mail through the air
B.Fenced huge areas cheaply and closed the open range
C.Sent messages along wires in minutes instead of weeks
D.Let one office worker do tasks that once took many people
3.The assembly line let workers build cars much faster. Predict an invention that could help factory workers produce more in the future, and explain how.
I explained what the assembly line changed.
I described my invention.
I explained how it would help workers produce more.
LessonPrint · D2.Eco.13.3-5 · Set 19 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 19. Prints on its own sheet.
1.1. Refrigerated railroad car, 1870s — B (Carried fresh meat across the country without spoiling) 2. Mechanical reaper, Cyrus McCormick, 1831 — D (Harvested wheat many times faster than by hand) 3. Light bulb, Thomas Edison, 1879 — C (Let factories and homes keep working after dark) 4. Cotton gin, Eli Whitney, 1793 — A (Cleaned cotton fast, which led planters to enslave even more people)
2.1. Barbed wire, Joseph Glidden, 1874 — B (Fenced huge areas cheaply and closed the open range) 2. Airplane, Wright brothers, 1903 — A (Carried people and mail through the air) 3. Personal computer, 1970s — D (Let one office worker do tasks that once took many people) 4. Telegraph, Samuel Morse, 1844 — C (Sent messages along wires in minutes instead of weeks)
3.Explains that the assembly line let workers build cars faster, then describes a future invention for factory workers and how it would help them produce more.
Last reviewed 2026-09-05. Aligned to D2.Eco.13.3-5 of the C3 Framework for Social Studies State Standards.