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 18 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.
Mechanical reaper, Cyrus McCormick, 1831
Steel plow, John Deere, 1837
Assembly line, Henry Ford, 1913
Airplane, Wright brothers, 1903
A.Carried people and mail through the air
B.Built cars step by step, cutting the time to make one
C.Cut through thick prairie soil so farmers could plant more land
D.Harvested wheat many times faster than by hand
2.Draw a line from each one to its match.
Cotton gin, Eli Whitney, 1793
Light bulb, Thomas Edison, 1879
Refrigerated railroad car, 1870s
Personal computer, 1970s
A.Let one office worker do tasks that once took many people
B.Let factories and homes keep working after dark
C.Cleaned cotton fast, which led planters to enslave even more people
D.Carried fresh meat across the country without spoiling
3.The telegraph and the telephone changed how people send messages. Predict how people might send messages in the future, and explain one good and one bad effect.
I described a future way to send messages.
I gave one good effect.
I gave one bad effect.
LessonPrint · D2.Eco.13.3-5 · Set 18 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 18. Prints on its own sheet.
1.1. Mechanical reaper, Cyrus McCormick, 1831 — D (Harvested wheat many times faster than by hand) 2. Steel plow, John Deere, 1837 — C (Cut through thick prairie soil so farmers could plant more land) 3. Assembly line, Henry Ford, 1913 — B (Built cars step by step, cutting the time to make one) 4. Airplane, Wright brothers, 1903 — A (Carried people and mail through the air)
2.1. Cotton gin, Eli Whitney, 1793 — C (Cleaned cotton fast, which led planters to enslave even more people) 2. Light bulb, Thomas Edison, 1879 — B (Let factories and homes keep working after dark) 3. Refrigerated railroad car, 1870s — D (Carried fresh meat across the country without spoiling) 4. Personal computer, 1970s — A (Let one office worker do tasks that once took many people)
3.Predicts a future way to send messages, linked to the telegraph or telephone, with one good effect and one bad effect explained.
Last reviewed 2026-09-05. Aligned to D2.Eco.13.3-5 of the C3 Framework for Social Studies State Standards.