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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 11 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.When the trains crossed Britain
  • B.How fast the trains went
  • C.A problem the railways ran into
2.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.When Fleming made the discovery
  • C.How the discovery became a medicine
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.How far an eruption's effects can reach
  • C.Where volcanoes form
4.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
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 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 bees make honey
  • C.How many bees live in a hive
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 X-rays were named
  • C.How quickly the discovery was put to use
8.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.The year the wolves returned
  • C.One effect the wolves had on other animals

LessonPrint · RI.4.9 · Set 11 · free to copy for classroom use

Answer key — What One Adds to the Other

Set 11. Prints on its own sheet.

  1. 1.A problem the railways ran into
  2. 2.How the discovery became a medicine
  3. 3.How far an eruption's effects can reach
  4. 4.How a camel refills on water
  5. 5.How the sand affects the young turtles
  6. 6.How people depend on bees
  7. 7.How quickly the discovery was put to use
  8. 8.One effect the wolves had on other animals

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