Cogito
Grade 2 Math · Chapter 8 · Lesson 5
Halves
Two equal shares of one whole.
10 problems · about 11 minutes · 2.G.A.3
Figure — use these to answer the problems
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsFrom “Cubes and Solid Shapes”
How many faces does a cube have?
AnswerFrom “Shapes by Their Sides”
A shape has 6 straight sides. What is it?
- A hexagon.
- A pentagon.
From “A.M. and P.M.”
Is 3 o’clock in the afternoon a.m. or p.m.?
- p.m.
- a.m.
From “Time to Five Minutes”
The long hand is on the 5. How many minutes past?
Answer
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many halves make one whole?
AnswerWhat must be true about halves?
- They are the same size.
- There are just two pieces.
How many equal shares make halves?
Answer
Build It Up
The same ideas with more to keep track of.
1 problemAre two pieces halves if one is bigger?
- No. They must be equal.
- Yes. There are two.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsThe Sandwich
A sandwich is shared equally between 2 people. What is each share called?
- A half.
- A fourth.
Putting It Back
How many halves make one whole?
Answer