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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 20 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 a camel refills on water
  • B.How hot deserts are
  • C.Where camels live
2.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
3.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.How short the first flight was
  • B.Who flew the first plane
  • C.The year of the first flight
4.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.Why coral can turn pale and starve
  • B.Where the biggest reef is
  • C.What builds coral
5.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.A problem the railways ran into
  • C.When the trains crossed Britain
6.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.What color the mold was
  • B.How the discovery became a medicine
  • C.When Fleming made the discovery
7.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 quickly the discovery was put to use
  • C.How X-rays were named
8.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.Where volcanoes form
  • B.What lava is made of
  • C.How far an eruption's effects can reach

LessonPrint · RI.4.9 · Set 20 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 20. Prints on its own sheet.

  1. 1.How a camel refills on water
  2. 2.How the sand affects the young turtles
  3. 3.How short the first flight was
  4. 4.Why coral can turn pale and starve
  5. 5.A problem the railways ran into
  6. 6.How the discovery became a medicine
  7. 7.How quickly the discovery was put to use
  8. 8.How far an eruption's effects can reach

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