2nd Grade Math Worksheet: Identifying Odd and Even Numbers Using Ten Frames and Counters

Let’s go step by step to solve each problem.

We are given tens frames — boxes with 10 spaces (2 rows of 5). Red dots represent counters. We need to:
1. Count all the red dots in both frames for each question.
2. Write that number.
3. Decide if it’s even or odd.

Remember:
- Even numbers can be split into two equal groups (like 2, 4, 6, 8, 10...).
- Odd numbers cannot be split evenly — one will always be left over (like 1, 3, 5, 7, 9...).

Also, a quick trick: if the last digit is 0, 2, 4, 6, or 8 → even. If it’s 1, 3, 5, 7, or 9 → odd.

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Problem 1:
Left frame: 10 dots (full)
Right frame: 1 dot
Total = 10 + 1 = 11
11 ends in 1 → odd

Already filled in example: “11 is an odd number.” ✔

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Problem 2:
Left frame: 10 dots
Right frame: 6 dots (top row 3, bottom row 3)
Total = 10 + 6 = 16
16 ends in 6 → even

Answer: 16 is an even number.

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Problem 3:
Left frame: 10 dots
Right frame: 3 dots (top row 2, bottom row 1)
Total = 10 + 3 = 13
13 ends in 3 → odd

Answer: 13 is an odd number.

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Problem 4:
Left frame: 10 dots
Right frame: 5 dots (top row 3, bottom row 2)
Total = 10 + 5 = 15
15 ends in 5 → odd

Answer: 15 is an odd number.

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Problem 5:
Left frame: 10 dots
Right frame: 2 dots (both in top row? Actually, looks like top left and bottom left — still 2)
Total = 10 + 2 = 12
12 ends in 2 → even

Answer: 12 is an even number.

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Problem 6:
Left frame: 10 dots
Right frame: 8 dots (top row 4, bottom row 4)
Total = 10 + 8 = 18
18 ends in 8 → even

Answer: 18 is an even number.

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Problem 7:
Left frame: 10 dots
Right frame: 7 dots (top row 4, bottom row 3)
Total = 10 + 7 = 17
17 ends in 7 → odd

Answer: 17 is an odd number.

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Problem 8:
Left frame: 10 dots
Right frame: 10 dots (full)
Total = 10 + 10 = 20
20 ends in 0 → even

Answer: 20 is an even number.

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Final Answer:
1) 11 is an odd number.
2) 16 is an even number.
3) 13 is an odd number.
4) 15 is an odd number.
5) 12 is an even number.
6) 18 is an even number.
7) 17 is an odd number.
8) 20 is an even number.