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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 17 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 sea turtles lay their eggs on beaches. Text 2 says the warmth of the sand decides whether the hatchlings are male or female. What does Text 2 add?
  • A.What turtles eat at sea
  • B.How the sand affects the young turtles
  • C.Where turtles lay their eggs
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.The year the wolves returned
  • B.How many wolves there were
  • C.One effect the wolves had on other animals
3.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.How long it took and who built it
  • C.What country the wall is in
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.How fast the trains went
  • B.When the trains crossed Britain
  • C.A problem the railways ran into
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 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
7.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
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 17 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 17. Prints on its own sheet.

  1. 1.How the sand affects the young turtles
  2. 2.One effect the wolves had on other animals
  3. 3.How long it took and who built it
  4. 4.A problem the railways ran into
  5. 5.What the dams do for the land
  6. 6.How short the first flight was
  7. 7.How a camel refills on water
  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.