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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 12 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.How fast the trains went
  • B.A problem the railways ran into
  • C.When the trains crossed Britain
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.How the sand affects the young turtles
  • B.What turtles eat at sea
  • C.Where turtles lay their eggs
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.Where volcanoes form
  • B.What lava is made of
  • 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.Why the roads mattered to the army
  • B.Who built the roads
  • C.What the roads were made of
5.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.What builds coral
  • B.Where the biggest reef is
  • C.Why coral can turn pale and starve
6.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
7.Text 1 says beavers build dams from sticks and mud. Text 2 says the dams slow rivers and store water for dry summers. What does Text 2 add?
  • A.How beavers build their dams
  • B.What the dams do for the land
  • C.What beavers eat
8.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.When Fleming made the discovery
  • B.How the discovery became a medicine
  • C.What color the mold was

LessonPrint · RI.4.9 · Set 12 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 12. Prints on its own sheet.

  1. 1.A problem the railways ran into
  2. 2.How the sand affects the young turtles
  3. 3.How far an eruption's effects can reach
  4. 4.Why the roads mattered to the army
  5. 5.Why coral can turn pale and starve
  6. 6.How people depend on bees
  7. 7.What the dams do for the land
  8. 8.How the discovery became a medicine

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