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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 7 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 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.The year the wolves returned
  • C.One effect the wolves had on other animals
2.Text 1 says volcanoes form where hot rock rises. Text 2 says the ash from one eruption cooled the whole world for a year. What does Text 2 add?
  • A.Where volcanoes form
  • B.How far an eruption's effects can reach
  • C.What lava is made of
3.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.A problem the railways ran into
  • C.How fast the trains went
4.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 it took and who built it
  • C.How long the wall is
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.What color the mold was
  • B.How the discovery became a medicine
  • C.When Fleming made the discovery
6.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 a camel refills on water
  • C.How hot deserts are
7.Text 1 says the Romans built straight roads across Britain. Text 2 says soldiers could march twenty miles a day on them. What does Text 2 add?
  • A.What the roads were made of
  • B.Who built the roads
  • C.Why the roads mattered to the army
8.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.What builds coral
  • C.Where the biggest reef is

LessonPrint · RI.4.9 · Set 7 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 7. Prints on its own sheet.

  1. 1.One effect the wolves had on other animals
  2. 2.How far an eruption's effects can reach
  3. 3.A problem the railways ran into
  4. 4.How long it took and who built it
  5. 5.How the discovery became a medicine
  6. 6.How a camel refills on water
  7. 7.Why the roads mattered to the army
  8. 8.Why coral can turn pale and starve

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