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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 15 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 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
2.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
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.The year the wolves returned
  • B.How many wolves there were
  • 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.How far an eruption's effects can reach
  • B.Where volcanoes form
  • C.What lava is made of
5.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.What the dams do for the land
  • C.How beavers build their dams
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.How a camel refills on water
  • B.Where camels live
  • C.How hot deserts are
7.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.How the discovery became a medicine
  • B.What color the mold was
  • C.When Fleming made the discovery
8.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

LessonPrint · RI.4.9 · Set 15 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 15. Prints on its own sheet.

  1. 1.How long it took and who built it
  2. 2.How quickly the discovery was put to use
  3. 3.One effect the wolves had on other animals
  4. 4.How far an eruption's effects can reach
  5. 5.What the dams do for the land
  6. 6.How a camel refills on water
  7. 7.How the discovery became a medicine
  8. 8.A problem the railways ran into

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