seegongsik
Grade 1 (age 6-7)

grade 1 Comparing

Comparing means deciding which of two things is longer, heavier, or greater in number. You do it when you line up two pencils or lift two bags to see which weighs more. For length you line up one end; for weight, the seesaw side that dips is heavier. Slide the pencil lengths and the block counts, and 7 > 4 is how you write which side is bigger.

What is comparing?

⚖️ Putting two things side by side
①Which is longer, and which is shorter?
②Which is heavier, and which is lighter?
③You can also ask which is wider and which is narrower
④Comparing shows you the difference between two things

Comparing length

7 cells
4 cells
📏 Comparing length
①The two pencils are lined up at their left ends
②The pencil that sticks out farther to the right is longer
③If the ends stop at the same place, the pencils are the same length
④Under the picture, the lengths are written with a symbol, like 7 > 4

Comparing weight

5
3
⚖️ Comparing weight
①Put blocks on the left side and the right side
②On a seesaw, the heavier side goes down
③The lighter side goes up
④With the same number of blocks, the seesaw stays level

More ways to compare

🔎 You can compare these too
①Area: bigger or smaller
②How much a container holds: more or less
③Height: taller or shorter
④Putting two things side by side makes comparing easy

Wrap-up

Comparing length
longer / shorter / the same
Line up one end first, then compare
Comparing weight
heavier / lighter / the same
Use a seesaw or a balance scale
Comparison symbols
greater: > / less: < / equal: =
Use > when the number on the left is bigger and < when it is smaller
🎯 Remember
①Line up one end when you compare lengths
②On a seesaw, the side that goes down is heavier
③Say greater, less, or the same
④The symbols for comparing are >, <, and =

Examples and unit check

Example 1
The yellow pencil is 7 cells long and the blue pencil is 4 cells long. Which pencil is longer?
1
Line up one end of the two pencils and compare the number of cells.
2
7 cells is longer than 4 cells (7 > 4), so the yellow pencil is longer.
▸ The yellow pencil (7 cells > 4 cells)
With one end lined up, the one that sticks out farther is longer.
Example 2
Blocks are put on both sides of a seesaw. The left side goes down and the right side goes up. Which side is heavier?
1
On a seesaw, the heavier side goes down.
2
The left side went down, so the left side is heavier.
▸ The left side (the side that went down)
On a seesaw, the heavy side goes down and the light side goes up.
Unit check
There are 8 strawberries and 5 tangerines. Which are there more of?
①strawberries
②tangerines
③they are equal
④cannot tell
▸ ① strawberries
1
Compare the two numbers, 8 and 5.
2
8 > 5, so there are more strawberries.
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Pattern Rules

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