Cogito
Grade 1 Math · Chapter 9 · Lesson 7
Fourths and Quarters
Cut a whole into four equal shares.
10 problems · about 13 minutes · 1.G.A.3
What this lesson teaches
The child partitions shapes into four equal shares, names them fourths or quarters, and sees that more shares means smaller shares.
- Four equal shares are called fourths, or quarters.
- A fourth is smaller than a half.
- Four fourths make one whole.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Halves: How many equal shares are in a half?
Answer 2
Why A half is one of 2 equal shares.
Review — Shapes Inside Shapes: How many triangles make one trapezoid?
Answer 3
Why A trapezoid is 3 triangles.
Review — Making New Shapes: How many triangles fill one hexagon?
Answer 6
Why It takes 6 triangles.
Review — Naming Solid Shapes: A can of soup is shaped like what?
Answer A cylinder.
Why A can is a cylinder.
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many fourths make one whole?
Answer 4
Why 4 fourths make the whole.
What is another word for a fourth?
Answer A quarter.
Why A fourth is also called a quarter.
How many fourths make one whole?
Answer 4
Why Put all the pieces back.
Build It Up
The same ideas with more to keep track of.
1 problemWhich is bigger, a half or a fourth?
Answer A half.
Why Fewer shares means bigger pieces.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsHow many fourths are in one half?
Answer 2
Why Shade two fourths and look.
Four Friends: Four friends share one cake fairly. How many shares?
Answer 4 shares
Why Four equal shares are called fourths.