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What One Adds to the Other is a free printable Grade 4 English worksheet on identifying what a second text adds to the first, aligned to Common Core standard RI.4.9. It prints 8 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 25 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.

What One Adds to the Other

RI.4.9

NameDate

Circle the right answer.

1.Text 1 says coral is built by tiny animals called polyps. Text 2 says warm water makes polyps push out the algae that feed them. What does Text 2 add?
  • A.Why coral can turn pale and starve
  • B.Where the biggest reef is
  • C.What builds coral
2.Text 1 says Rontgen discovered X-rays in 1895. Text 2 says that within a year hospitals were using X-rays to find broken bones. What does Text 2 add?
  • A.How quickly the discovery was put to use
  • B.How X-rays were named
  • C.Who discovered X-rays
3.Text 1 says camels live in hot deserts. Text 2 says a camel can drink a hundred liters of water in ten minutes. What does Text 2 add?
  • A.Where camels live
  • B.How hot deserts are
  • C.How a camel refills on water
4.Text 1 says sea turtles lay their eggs on beaches. Text 2 says the warmth of the sand decides whether the hatchlings are male or female. What does Text 2 add?
  • A.What turtles eat at sea
  • B.How the sand affects the young turtles
  • C.Where turtles lay their eggs
5.Text 1 says Fleming noticed mold killing germs in 1928. Text 2 says Florey and Chain found how to make penicillin in large amounts. What does Text 2 add?
  • A.When Fleming made the discovery
  • B.How the discovery became a medicine
  • C.What color the mold was
6.Text 1 says the Great Wall of China is thousands of kilometers long. Text 2 says it was built over many centuries by different rulers. What does Text 2 add?
  • A.What country the wall is in
  • B.How long the wall is
  • C.How long it took and who built it
7.Text 1 says wolves were brought back to Yellowstone in 1995. Text 2 says elk stopped grazing by the rivers once the wolves returned. What does Text 2 add?
  • A.How many wolves there were
  • B.One effect the wolves had on other animals
  • C.The year the wolves returned
8.Text 1 says trains crossed Britain by the 1840s. Text 2 says each town kept its own time, so schedules were confusing. What does Text 2 add?
  • A.When the trains crossed Britain
  • B.How fast the trains went
  • C.A problem the railways ran into

LessonPrint · RI.4.9 · Set 25 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 25. Prints on its own sheet.

  1. 1.Why coral can turn pale and starve
  2. 2.How quickly the discovery was put to use
  3. 3.How a camel refills on water
  4. 4.How the sand affects the young turtles
  5. 5.How the discovery became a medicine
  6. 6.How long it took and who built it
  7. 7.One effect the wolves had on other animals
  8. 8.A problem the railways ran into

Last reviewed 2026-09-05. Aligned to RI.4.9 of the Common Core State Standards for English Language Arts.