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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 21 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.A problem the railways ran into
  • B.When the trains crossed Britain
  • C.How fast the trains went
2.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.One effect the wolves had on other animals
  • C.The year the wolves returned
3.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.What lava is made of
  • B.Where volcanoes form
  • C.How far an eruption's effects can reach
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.Who built the roads
  • B.Why the roads mattered to the army
  • C.What the roads were made of
5.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
6.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 the wall is
  • B.What country the wall is in
  • C.How long it took and who built it
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.Where camels live
  • B.How a camel refills on water
  • C.How hot deserts are
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.Why coral can turn pale and starve
  • C.What builds coral

LessonPrint · RI.4.9 · Set 21 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 21. Prints on its own sheet.

  1. 1.A problem the railways ran into
  2. 2.One effect the wolves had on other animals
  3. 3.How far an eruption's effects can reach
  4. 4.Why the roads mattered to the army
  5. 5.How quickly the discovery was put to use
  6. 6.How long it took and who built it
  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.