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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 24 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 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.The year the wolves returned
  • B.One effect the wolves had on other animals
  • C.How many wolves there were
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 people depend on bees
  • B.How many bees live in a hive
  • C.How bees make honey
3.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 it took and who built it
  • B.What country the wall is in
  • C.How long the wall is
4.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
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 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.How far an eruption's effects can reach
  • C.Where volcanoes form
7.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
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.What builds coral
  • B.Why coral can turn pale and starve
  • C.Where the biggest reef is

LessonPrint · RI.4.9 · Set 24 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 24. Prints on its own sheet.

  1. 1.One effect the wolves had on other animals
  2. 2.How people depend on bees
  3. 3.How long it took and who built it
  4. 4.How the discovery became a medicine
  5. 5.How quickly the discovery was put to use
  6. 6.How far an eruption's effects can reach
  7. 7.How the sand affects the young turtles
  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.