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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 5 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 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.When the trains crossed Britain
  • B.A problem the railways ran into
  • C.How fast the trains went
2.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.What the roads were made of
  • B.Who built the roads
  • C.Why the roads mattered to the army
3.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 hot deserts are
  • C.How a camel refills on water
4.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
5.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.How the sand affects the young turtles
  • B.What turtles eat at sea
  • C.Where turtles lay their eggs
6.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
7.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 it took and who built it
  • B.What country the wall is in
  • C.How long the wall is
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 people depend on bees
  • C.How many bees live in a hive

LessonPrint · RI.4.9 · Set 5 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 5. Prints on its own sheet.

  1. 1.A problem the railways ran into
  2. 2.Why the roads mattered to the army
  3. 3.How a camel refills on water
  4. 4.How the discovery became a medicine
  5. 5.How the sand affects the young turtles
  6. 6.One effect the wolves had on other animals
  7. 7.How long it took and who built it
  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.