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 3 of 25 · the same problems every time you open this link.
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 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.What color the mold was
C.How the discovery became a medicine
2.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
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 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
5.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.What the roads were made of
C.Why the roads mattered to the army
6.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 a camel refills on water
B.How hot deserts are
C.Where camels live
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 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.What the dams do for the land
B.How beavers build their dams
C.What beavers eat
LessonPrint · RI.4.9 · Set 3 · free to copy for classroom use
Answer key — What One Adds to the Other
Set 3. Prints on its own sheet.
1.How the discovery became a medicine
2.A problem the railways ran into
3.How far an eruption's effects can reach
4.How people depend on bees
5.Why the roads mattered to the army
6.How a camel refills on water
7.How quickly the discovery was put to use
8.What the dams do for the land
Last reviewed 2026-09-05. Aligned to RI.4.9 of the Common Core State Standards for English Language Arts.