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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 4 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 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.What lava is made of
  • B.Where volcanoes form
  • C.How far an eruption's effects can reach
2.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.One effect the wolves had on other animals
  • B.How many wolves there were
  • C.The year the wolves returned
3.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.How beavers build their dams
  • C.What beavers eat
4.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.A problem the railways ran into
  • B.How fast the trains went
  • C.When the trains crossed Britain
5.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
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 bees make honey
  • B.How many bees live in a hive
  • C.How people depend on bees
7.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.How long it took and who built it
  • B.How long the wall is
  • C.What country the wall is in
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.How quickly the discovery was put to use
  • B.Who discovered X-rays
  • C.How X-rays were named

LessonPrint · RI.4.9 · Set 4 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 4. Prints on its own sheet.

  1. 1.How far an eruption's effects can reach
  2. 2.One effect the wolves had on other animals
  3. 3.What the dams do for the land
  4. 4.A problem the railways ran into
  5. 5.Why coral can turn pale and starve
  6. 6.How people depend on bees
  7. 7.How long it took and who built it
  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.