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Which Evidence Supports What is a free printable Grade 4 English worksheet on matching a piece of evidence to its claim, aligned to Common Core standard RI.4.8. 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 pupils 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.

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

Which Evidence Supports What

RI.4.8

NameDate

Read the text, then answer the questions.

1.Read the text, then answer the questions.

Why Clocks Agree

Until the 1840s, every British town kept its own time, set by the sun. Noon in Bristol was about ten minutes after noon in London. That was no problem while the fastest thing on the road was a horse. The railways changed it. A timetable cannot work if every station measures noon differently, and trains sharing a track need to agree about when. So the railway companies imposed London time on their whole network. People called it railway time. Some towns kept two minute hands on the town clock for years, one local and one railway. In 1880 Parliament made a single time legal across the country. The sun had been overruled by the timetable.

  1. 1. What is the author's purpose, and how do you know?
  2. 2. The text says local time was no problem before the railways. What reason is given?
2.Read the text, then answer the questions.

How Penicillin Was Found

In 1928 Alexander Fleming went on holiday and left a stack of dishes on a bench. Each held a colony of bacteria. When he came back, one dish had a spot of mould on it. Around the mould was a clear ring where the bacteria had died. Fleming realised the mould was producing something that killed bacteria. He named it penicillin and published a paper. Almost nobody noticed. Ten years later, Howard Florey and Ernst Chain read that paper and tried to make penicillin in quantity. That turned out to be the hard part: it took two thousand litres of mould fluid to treat one patient. By 1944 the problem had been solved and penicillin was reaching soldiers in the field.

  1. 1. What is the author's purpose, and how do you know?
  2. 2. The text says the hard part was not the discovery. What evidence supports that?

LessonPrint · RI.4.8 · Set 18 · free to copy for classroom use

Answer key — Which Evidence Supports What

Set 18. Prints on its own sheet.

  1. 1.1. To explain why clocks agree — the text traces the cause from local time to national law. 2. The fastest thing on the road was a horse, so a ten-minute difference did not matter.
  2. 2.1. To correct the idea that penicillin was one lucky accident — the second half is all about the work that followed. 2. It took ten years for anyone to act, and two thousand litres of fluid to treat one patient.

Last reviewed 2026-09-05. Aligned to RI.4.8 of the Common Core State Standards for English language arts.