# Lesson 1- Identifying Odd and Even Numbers

Objectives:

At the end of this lesson, students should be able to,

• Identify odd, even, prime, composite, square and triangular numbers.
• Determine the sum, difference and product of odd and even numbers.

When we talk of properties of numbers, we refer to whether the number is odd, even, prime, square etc.

SOME DEFINITIONS:

ODD NUMBERS: These are numbers that always leave a remainder when divided by 2.

Odd numbers are not seen in the two times table. They end in 1, 3, 5, 7 or 9.

Examples are 1, 3, 5, 7, 9, 11, 13, 15, 45, 127, 2369, 33033, 101, 815, 24519, 6000003, etc.

EVEN NUMBERS: These are numbers that do not have a remainder when divided by 2.

Even numbers are numbers in the two times table. They end in 2, 4, 6, 8 or 0.

Examples are 2, 4, 6, 8, 10, 12, 14, 16, 46, 932, 10258, 5620, 102004, 756148, etc.

Unit 4 Lesson 1: Exercise 1

Try these,

1. Write the odd numbers between 500 and 550
2. What are the even numbers between 700 and 750?
3. Write two odd numbers between 359 and 400.
4. Is 906,103 even or odd?
5. Is one hundred million, seventy seven thousand and seven even or odd?
6. Is six hundred and seventy eight thousand odd or even?
7. 1,809,700 is even, true or false?
8. Which of these numbers is even, 2,561,303 and 6,603,006?
9. Write down all the even numbers, 26315, 26506, 12554, 31255, and 20080.
10. Write down all the odd numbers, 46213, 49356, 96001, 75042 and 90651.

Unit 4 Lesson 1: Exercise 2

Now try these 1. Use the digits above to make 4 six digit odd numbers without repeating any digit.
2. Make 4 six digit even numbers using the digits above without repeating any of the digits.
3. Use 6, 4, 7 and 5 to make six 3 digit odd numbers.
4. Use 5, 1, 0, and 6 to make six 3 digit even numbers.
5. Put all the digits together to make three odd numbers ending in 7.

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