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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 18 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 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 hot deserts are
  • B.How a camel refills on water
  • C.Where camels live
2.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.Who flew the first plane
  • B.The year of the first flight
  • C.How short the first flight was
3.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.Where turtles lay their eggs
  • B.How the sand affects the young turtles
  • C.What turtles eat at sea
4.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.What beavers eat
  • C.How beavers build their dams
5.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.When Fleming made the discovery
  • C.What color the mold was
6.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.How X-rays were named
  • C.Who discovered X-rays
7.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.The year the wolves returned
  • C.How many wolves there were
8.Text 1 says the Romans built straight roads across Britain. Text 2 says soldiers could march twenty miles a day on them. What does Text 2 add?
  • A.Why the roads mattered to the army
  • B.Who built the roads
  • C.What the roads were made of

LessonPrint · RI.4.9 · Set 18 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 18. Prints on its own sheet.

  1. 1.How a camel refills on water
  2. 2.How short the first flight was
  3. 3.How the sand affects the young turtles
  4. 4.What the dams do for the land
  5. 5.How the discovery became a medicine
  6. 6.How quickly the discovery was put to use
  7. 7.One effect the wolves had on other animals
  8. 8.Why the roads mattered to the army

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