I am a 2D shapes with no sides and no vertices.
Circle
Define a whole.
An item where there are no shares, or all the shares are there.
Hannah has 24 marbles. She gave 12 to James, and then Lola gave her 14. How many marbles does Hannah have now?
26
Using base ten blocks:
24+53
77
I am a 2D shape with 3 sides and 3 vertices
Triangle
Define a half
one equal share of 2 shares
Michael has 37 apples. Tiffany gave him 10 more apples, and then he gave 9 to Taylor. How many apples does Michael have now?
38
Using place value:
62+19
81
I am a 2D shape with 5 sides and 5 vertices
Pentagon
Define a third
one equal share of 3 shares
Rhonda has 46 markers for a project. Her teacher took away 15 markers, and then her friend took 16 more. How many markers does Rhonda have now?
15
Using the number line:
47+13
60
I am a 2D shape with 6 sides and 6 vertices
Hexagon
Define a fourth
one equal share of 4 shares
Anna has 20 straws. Chris gave her 15 straws, but then Mary took 33 of them. How many straws does Anna have now?
2
Use any strategy:
34+55
89
I am a 2D shape with 4 sides and 4 vertices
Quadrilateral
Define equal parts
when all of the whole's pieces are the same shape and size.
Shelby has 24 students in her classroom. She got 2 new students, but then 13 of them moved. How many students does Shelby have now?
13
Use any strategy:
77+23
100