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How Four Discoveries Changed Lives is a free printable Grade 3 to Grade 5 social studies worksheet on the causes and effects of four inventions, aligned to C3 Framework indicator D2.His.14.3-5. It prints 2 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.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

How Four Discoveries Changed Lives

D2.His.14.3-5

NameDate

Read each information text, then answer the questions.

1.Read the information text, then answer the questions.

Louis Pasteur and Safer Milk

An information text written for this worksheet. In the 1800s, milk and other foods often spoiled quickly, and milk could carry germs that made people, especially young children, very sick. Louis Pasteur, a French scientist, showed in the 1860s that tiny living things called microbes make food spoil. He found that heating a liquid such as wine for a short time, without boiling it, and then cooling it, killed most of the harmful microbes without ruining the taste. This method is named pasteurization, after him. Later, cities in Europe and the United States began to require that milk be pasteurized. Fewer children became sick from milk, and milk stayed fresh for longer, so it could be shipped farther.

  1. 1. What did Pasteur show makes food spoil?
  2. 2. Why could pasteurized milk be shipped farther?
  3. 3. Why did fewer children become sick from milk?
2.Read the information text, then answer the questions.

Cyrus McCormick and the Reaper

An information text written for this worksheet. In the early 1800s, farmers cut ripe wheat by hand with a curved blade called a sickle or a scythe. Wheat must be harvested quickly once it is ripe, so a farm family could only plant as much as they could cut in a few weeks. In 1831, Cyrus McCormick showed a reaper on his family's farm in Virginia. Jo Anderson, a man enslaved on the farm, helped with the work, but the records say little about what he did. Pulled by a horse, the machine cut the wheat as it moved across the field. With a reaper, a few workers could harvest far more wheat in a day than many workers could by hand. In 1847 McCormick opened a factory in Chicago, close to the prairie farms. Farmers on the wide prairies of the Midwest began to plant much bigger fields, and fewer people were needed for farm work.

  1. 1. What pulled the reaper?
  2. 2. How did farmers cut wheat before the reaper?
  3. 3. Who helped with the work on the reaper on the family farm?

LessonPrint · D2.His.14.3-5 · Set 14 · free to copy for classroom use

Answer key — How Four Discoveries Changed Lives

Set 14. Prints on its own sheet.

  1. 1.1. Tiny living things called microbes. 2. It stayed fresh for longer. 3. Cities required milk to be pasteurized, which killed most harmful microbes.
  2. 2.1. A horse. 2. By hand, with a curved blade called a sickle or a scythe. 3. Jo Anderson, a man enslaved on the farm.

Last reviewed 2026-09-05. Aligned to D2.His.14.3-5 of the C3 Framework for Social Studies State Standards.