Cogito
Grade 1 Math · Chapter 1 · Lesson 1
See It Fast
Look at dots and know how many, without counting.
3 problems · about 9 minutes · 1.OA.C.5, 1.OA.C.6
What this lesson teaches
The child instantly recognizes how many objects are in structured arrangements of 1-5, without counting them one by one (perceptual subitizing).
- You can know how many without counting.
- A shape you know, like a dice pattern, is easy to see fast.
- This is called subitizing.
Warm Up
Straightforward practice. Get the method working first.
2 problemsWhich picture shows 4, arranged so it is easy to see fast?
Answer A dice pattern showing four dots
Why Both show 4! The dice pattern is easier to see fast because it has a shape you know.
How many dots? Try to see it without counting.
Answer 5
Why A full row of 5 is a shape worth knowing. It shows up everywhere.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemAt the Park: You see 3 ducks by the pond in a line, all at once. How many ducks are there?
Answer 3 ducks
Why You saw the group as one shape — 3 in a row — instead of counting each duck.