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 12 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.
Airplane, Wright brothers, 1903
Assembly line, Henry Ford, 1913
Mechanical reaper, Cyrus McCormick, 1831
Light bulb, Thomas Edison, 1879
A.Harvested wheat many times faster than by hand
B.Carried people and mail through the air
C.Built cars step by step, cutting the time to make one
D.Let factories and homes keep working after dark
2.Draw a line from each one to its match.
Personal computer, 1970s
Refrigerated railroad car, 1870s
Telephone, Alexander Graham Bell, 1876
Telegraph, Samuel Morse, 1844
A.Carried fresh meat across the country without spoiling
B.Let one office worker do tasks that once took many people
C.Let people talk to each other over long distances
D.Sent messages along wires in minutes instead of weeks
3.The cotton gin helped planters but led to more people being enslaved. Explain why an invention can help some people and harm others, then predict one invention and who might be harmed by it.
I explained the cotton gin's effects.
I predicted an invention.
I named who it might help and who it might harm.
LessonPrint · D2.Eco.13.3-5 · Set 12 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 12. Prints on its own sheet.
1.1. Airplane, Wright brothers, 1903 — B (Carried people and mail through the air) 2. Assembly line, Henry Ford, 1913 — C (Built cars step by step, cutting the time to make one) 3. Mechanical reaper, Cyrus McCormick, 1831 — A (Harvested wheat many times faster than by hand) 4. Light bulb, Thomas Edison, 1879 — D (Let factories and homes keep working after dark)
2.1. Personal computer, 1970s — B (Let one office worker do tasks that once took many people) 2. Refrigerated railroad car, 1870s — A (Carried fresh meat across the country without spoiling) 3. Telephone, Alexander Graham Bell, 1876 — C (Let people talk to each other over long distances) 4. Telegraph, Samuel Morse, 1844 — D (Sent messages along wires in minutes instead of weeks)
3.Explains that the cotton gin helped planters while leading to more enslaved people, then predicts an invention and names who it might help and who it might harm.
Last reviewed 2026-09-05. Aligned to D2.Eco.13.3-5 of the C3 Framework for Social Studies State Standards.