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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 2 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 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.How beavers build their dams
  • B.What beavers eat
  • C.What the dams do for the land
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.A problem the railways ran into
  • B.How fast the trains went
  • C.When the trains crossed Britain
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.What color the mold was
  • B.When Fleming made the discovery
  • C.How the discovery became a medicine
4.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 bees make honey
  • C.How people depend on bees
5.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.How far an eruption's effects can reach
  • C.Where volcanoes form
6.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.Where the biggest reef is
  • B.What builds coral
  • C.Why coral can turn pale and starve
7.Text 1 says the Wright brothers flew the first powered plane in 1903. Text 2 says the flight lasted twelve seconds. What does Text 2 add?
  • A.The year of the first flight
  • B.How short the first flight was
  • C.Who flew the first plane
8.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

LessonPrint · RI.4.9 · Set 2 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 2. Prints on its own sheet.

  1. 1.What the dams do for the land
  2. 2.A problem the railways ran into
  3. 3.How the discovery became a medicine
  4. 4.How people depend on bees
  5. 5.How far an eruption's effects can reach
  6. 6.Why coral can turn pale and starve
  7. 7.How short the first flight was
  8. 8.How long it took and who built it

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