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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 16 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 coral is built by tiny animals called polyps. Text 2 says warm water makes polyps push out the algae that feed them. What does Text 2 add?
  • A.Where the biggest reef is
  • B.What builds coral
  • C.Why coral can turn pale and starve
2.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
3.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.What the roads were made of
  • C.Who built the roads
4.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 X-rays were named
  • C.How quickly the discovery was put to use
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.What turtles eat at sea
  • B.How the sand affects the young turtles
  • C.Where turtles lay their eggs
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 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
8.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

LessonPrint · RI.4.9 · Set 16 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 16. Prints on its own sheet.

  1. 1.Why coral can turn pale and starve
  2. 2.How people depend on bees
  3. 3.Why the roads mattered to the army
  4. 4.How quickly the discovery was put to use
  5. 5.How the sand affects the young turtles
  6. 6.How short the first flight was
  7. 7.A problem the railways ran into
  8. 8.How a camel refills on water

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