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Self-Correct as You Read is a free printable Grade 4 English worksheet on going back over an information text to fix understanding, aligned to Common Core standard RF.4.4. 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.

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

Self-Correct as You Read

RF.4.4

NameDate

Read the text, then answer the questions.

1.Read the text, then answer the questions.

The Longitude Problem

A ship's latitude — how far north or south it is — can be found from the height of the sun at noon. Sailors could do that for centuries. Longitude, how far east or west, was the problem. It has no natural marker. The solution was known in principle: compare the time on board with the time at a fixed place. The Earth turns fifteen degrees an hour, so every hour of difference is fifteen degrees of longitude. That required a clock that stayed accurate on a rolling, salty, temperature-swinging ship. No such clock existed. John Harrison, a carpenter, spent forty-three years building four. The fourth, finished in 1759, was the size of a large pocket watch and lost five seconds in eighty-one days at sea.

  1. 1. What is "longitude"?
  2. 2. How long did Harrison spend on the problem?
  3. 3. What does "accurate" mean in this text?
  4. 4. How many degrees does the Earth turn in an hour?
2.Read the text, then answer the questions.

The Accidental Photograph

In 1895 Wilhelm Röntgen was working with a covered tube in a darkened room when he noticed a screen across the laboratory glowing. Something was passing through the cover and crossing the room. He did not know what it was, so he called it X — the unknown. He spent seven weeks alone in the laboratory testing it. He put wood, rubber and metal in the way. Metal stopped it; the rest did not. Then he asked his wife to put her hand between the tube and a photographic plate. The picture showed the bones of her hand and her wedding ring. Within a year, X-rays were being used in hospitals. Röntgen refused to patent them.

  1. 1. What is a "photographic plate"?
  2. 2. What does "patent" mean?
  3. 3. In what year did Röntgen notice the glow?
  4. 4. Which material stopped the rays?

LessonPrint · RF.4.4 · Set 25 · free to copy for classroom use

Answer key — Self-Correct as You Read

Set 25. Prints on its own sheet.

  1. 1.1. How far east or west a place is. 2. Forty-three years. 3. Keeping the correct time without drifting. 4. Fifteen.
  2. 2.1. A photographic plate is the light-sensitive sheet the picture of the hand was recorded on. 2. To patent is to register an invention so only you may profit from it — Rontgen refused to. 3. 1895. 4. Metal.

Last reviewed 2026-09-05. Aligned to RF.4.4 of the Common Core State Standards for English language arts.