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.
Set 1 of 25 · the same problems every time you open this link.
Read each information text, then answer the questions.
1.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. Who helped with the work on the reaper on the family farm?
2. How did the reaper change the number of people working on farms?
3. Why did Midwest farmers begin to plant much bigger fields?
2.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. Why did fewer children become sick from milk?
2. How does pasteurization work?
3. What did Pasteur show makes food spoil?
LessonPrint · D2.His.14.3-5 · Set 1 · free to copy for classroom use
Answer key — How Four Discoveries Changed Lives
Set 1. Prints on its own sheet.
1.1. Jo Anderson, a man enslaved on the farm. 2. Fewer people were needed for farm work. 3. With a reaper, a few workers could harvest far more wheat in a day.
2.1. Cities required milk to be pasteurized, which killed most harmful microbes. 2. A liquid is heated for a short time, without boiling it, then cooled. 3. Tiny living things called microbes.
Questions about How Four Discoveries Changed Lives
What does the How Four Discoveries Changed Lives worksheet cover?
It practices the causes and effects of four inventions — 2 questions for Grade 3 to Grade 5, all on C3 Framework D2.His.14.3-5: Explain the likely causes and effects of an event. The instruction to students is “Read each information text, then answer the questions”, and the answer key follows on the next sheet.
Which C3 Framework indicator does How Four Discoveries Changed Lives practice?
D2.His.14.3-5, under History for Grade 3 to Grade 5. The published indicator reads: “Explain probable causes and effects of events and developments.” The worksheet assesses that indicator rather than a paraphrase of it.
What age or grade is this worksheet for?
How Four Discoveries Changed Lives is written for Grade 3 to Grade 5, typically ages 40-41. It is one of the sheets on D2.His.14.3-5, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.
Does How Four Discoveries Changed Lives come with an answer key?
Yes. All 2 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.
How many different versions of How Four Discoveries Changed Lives can I print?
25 — one per student, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.
Is How Four Discoveries Changed Lives free to print and photocopy?
Yes. How Four Discoveries Changed Lives, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.
More practice for D2.His.14.3-5
Explain the likely causes and effects of an event.