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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 14 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 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
3.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.What color the mold was
  • C.How the discovery became a medicine
4.Text 1 says beavers build dams from sticks and mud. Text 2 says the dams slow rivers and store water for dry summers. What does Text 2 add?
  • A.What the dams do for the land
  • B.What beavers eat
  • C.How beavers build their dams
5.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
6.Text 1 says honeybees live in hives of thousands. Text 2 says farmers rent hives so bees will pollinate their orchards. What does Text 2 add?
  • A.How many bees live in a hive
  • B.How people depend on bees
  • C.How bees make honey
7.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.How far an eruption's effects can reach
  • B.Where volcanoes form
  • C.What lava is made of
8.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.Who discovered X-rays
  • B.How quickly the discovery was put to use
  • C.How X-rays were named

LessonPrint · RI.4.9 · Set 14 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 14. Prints on its own sheet.

  1. 1.Why coral can turn pale and starve
  2. 2.A problem the railways ran into
  3. 3.How the discovery became a medicine
  4. 4.What the dams do for the land
  5. 5.One effect the wolves had on other animals
  6. 6.How people depend on bees
  7. 7.How far an eruption's effects can reach
  8. 8.How quickly the discovery was put to use

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