Odd and Even Numbers
LI: I am learning to understand the properties of odd and even numbers
SC: So I can check if my answers are correct.
SC: So I can check if my answers are correct.
Numbers have characteristics
1) What makes a number odd or even?
2) Do you know of ways that people use odd and even numbers to check their answers? e.g. smart lazy?
- Discovery of patterns between odds and evens using unifix cubes (done in pairs):
- Have students tell you the first 5 odd numbers: 1, 3, 5, 7, 9
- To have students learn to visualize what an odd number looks like, have them
make these odd numbers (1, 3, 5, 7, 9) with unifix cubes. - Have them make additional odd numbers and then generalize that the shape made by an odd number always has one cube sticking out which cannot be paired with another cube. Challenge them to work as a table to make the biggest odd number- shape! How do they know it’s odd?
- Now have students tell the first five even numbers: 2, 4, 6, 8, 10
- Have them make these first five even numbers with unifix cubes as follows:
- Have students tell you the first 5 odd numbers: 1, 3, 5, 7, 9
- Rules for adding odd and even numbers:
Even + Even = Even 2 + 4 = 6
Odd + Even = Odd 1 + 3 = 5
- Rules for subtracting odd and even numbers:
Even - Even = Even 8 - 4 = 4
Odd - Even = Odd 7 - 2 = 5
- Rules for multiplying odd and even numbers:
Even X Even = Even 2 X 4 = 8
Odd X Even = Even 3 X 6 = 18
- Rules for dividing odd and even numbers:
Even / Even = Even 20 / 2 = 2
Odd / Even = Even 56 / 8 = 6