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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 23 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 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.How far an eruption's effects can reach
  • C.What lava is made of
2.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
3.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
4.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
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.Where turtles lay their eggs
  • C.How the sand affects the young turtles
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.One effect the wolves had on other animals
  • B.How many wolves there were
  • C.The year the wolves returned
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 hot deserts are
  • B.Where camels live
  • C.How a camel refills on water
8.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

LessonPrint · RI.4.9 · Set 23 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 23. Prints on its own sheet.

  1. 1.How far an eruption's effects can reach
  2. 2.How quickly the discovery was put to use
  3. 3.A problem the railways ran into
  4. 4.Why the roads mattered to the army
  5. 5.How the sand affects the young turtles
  6. 6.One effect the wolves had on other animals
  7. 7.How a camel refills on water
  8. 8.Why coral can turn pale and starve

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