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 21 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
Airplane, Wright brothers, 1903
Personal computer, 1970s
Barbed wire, Joseph Glidden, 1874
A.Fenced huge areas cheaply and closed the open range
B.Let one office worker do tasks that once took many people
C.Carried people and mail through the air
D.Harvested wheat many times faster than by hand
2.Draw a line from each one to its match.
Telephone, Alexander Graham Bell, 1876
Cotton gin, Eli Whitney, 1793
Steel plow, John Deere, 1837
Assembly line, Henry Ford, 1913
A.Cleaned cotton fast, which led planters to enslave even more people
B.Built cars step by step, cutting the time to make one
C.Let people talk to each other over long distances
D.Cut through thick prairie soil so farmers could plant more land
3.Choose one invention from this sheet and explain how it helped people produce more. Then predict an invention that could help farmers grow more food in the future.
I named an invention and what it changed.
I explained how it helped people produce more.
I described a future invention for farmers and how it would help.
LessonPrint · D2.Eco.13.3-5 · Set 21 · free to copy for classroom use
Answer key — Machines That Changed American Work
Set 21. Prints on its own sheet.
1.1. Mechanical reaper, Cyrus McCormick, 1831 — D (Harvested wheat many times faster than by hand) 2. Airplane, Wright brothers, 1903 — C (Carried people and mail through the air) 3. Personal computer, 1970s — B (Let one office worker do tasks that once took many people) 4. Barbed wire, Joseph Glidden, 1874 — A (Fenced huge areas cheaply and closed the open range)
2.1. Telephone, Alexander Graham Bell, 1876 — C (Let people talk to each other over long distances) 2. Cotton gin, Eli Whitney, 1793 — A (Cleaned cotton fast, which led planters to enslave even more people) 3. Steel plow, John Deere, 1837 — D (Cut through thick prairie soil so farmers could plant more land) 4. Assembly line, Henry Ford, 1913 — B (Built cars step by step, cutting the time to make one)
3.Names an invention from the sheet and explains how it helped people produce more, then predicts a believable future invention that would help farmers grow more food, with a reason.
Last reviewed 2026-09-05. Aligned to D2.Eco.13.3-5 of the C3 Framework for Social Studies State Standards.