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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 22 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 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
2.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
3.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
4.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.What lava is made of
  • C.How far an eruption's effects can reach
5.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.Who flew the first plane
  • C.How short the first flight 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.How long the wall is
  • B.What country the wall is in
  • C.How long it took and who built it
7.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 beavers eat
  • B.How beavers build their dams
  • C.What the dams do for the land
8.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

LessonPrint · RI.4.9 · Set 22 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 22. Prints on its own sheet.

  1. 1.How quickly the discovery was put to use
  2. 2.How a camel refills on water
  3. 3.One effect the wolves had on other animals
  4. 4.How far an eruption's effects can reach
  5. 5.How short the first flight was
  6. 6.How long it took and who built it
  7. 7.What the dams do for the land
  8. 8.How people depend on bees

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