Beginner:

1. Write down all the even numbers between 1 and 20:
   2, 4, 6, 8, 10, 12, 14, 16, 18, 20

2. Write down all the odd numbers between 10 and 30:
   11, 13, 15, 17, 19, 21, 23, 25, 27, 29

3. Circle the even numbers:
   8, 14, 20

4. Circle the odd numbers:
   3, 7, 15

5. Is 12 an even or odd number?
   Even

6. Is 21 an even or odd number?
   Odd

7. Fill in the blanks:

   • 2, 4, 6, 8, 10, 12

   • 1, 3, 5, 7, 9, 11

Intermediate:

1. Write the next three even numbers after 26:
   28, 30, 32

2. Write the next three odd numbers after 31:
   33, 35, 37

3. Which of these numbers are even?
   44, 56, 78

4. Add the even numbers:
   4 + 10 + 22 = 36

5. Add the odd numbers:
   7 + 15 + 19 = 41

6. True or False: All numbers divisible by 2 are even.
   True

7. Fill in the blanks:

   • 10 + 8 = 18 (Even)

   • 15 + 9 = 24 (Even)

Advanced:

1. Write a rule to determine if a number is even or odd:
   A number is even if it is divisible by 2 without a remainder. A number is odd if it leaves a remainder of 1 when divided by 2.

2. Find the sum of all even numbers between 1 and 50:
   2+4+6+⋯+50=6502 + 4 + 6 + \dots + 50 = 6502+4+6+⋯+50=650

3. Find the sum of all odd numbers between 1 and 50:
   1+3+5+⋯+49=6251 + 3 + 5 + \dots + 49 = 6251+3+5+⋯+49=625

4. If you multiply an even number by an odd number, is the result even or odd?
   The result is always even. Example: 2×3=62 \times 3 = 62×3=6.

5. If you add two even numbers, is the result even or odd? Prove with an example.
   The result is always even. Example: 2+4=62 + 4 = 62+4=6.

6. If you add two odd numbers, is the result even or odd? Prove with an example.
   The result is always even. Example: 3+5=83 + 5 = 83+5=8.

7. Which of these numbers is divisible by 2?
   18, 40, 62

End of Answer Key

Questions

Answer Key: Even and odd numbers