Math riddle cards featuring three-digit number puzzles with fun fish graphics.

Let's solve each of the four riddles step by step. These are logic puzzles involving three-digit numbers and clues about their digits.

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Riddle 1:

> My tens digit is one more than my hundreds digit.
> My hundreds digit is an even number between 5 and 7.
> My ones digit is the number of vertices on a triangle.
> What am I?

#### Step-by-step:
- Hundreds digit: "an even number between 5 and 7" → The only even number in that range is 6.
- Tens digit: "one more than my hundreds digit" → 6 + 1 = 7
- Ones digit: "the number of vertices on a triangle" → A triangle has 3 vertices.
- So, the number is: 673

✔ Answer: 673

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Riddle 2:

> I'm an even number between 100 and 200.
> The sum of my digits is 14.
> My tens digit is two less than nine.
> What am I?

#### Step-by-step:
- Even number between 100 and 200 → so it’s a three-digit number starting with 1, and ends in an even digit (0, 2, 4, 6, 8).
- Tens digit: "two less than nine" → 9 - 2 = 7
- So far: 1 _ 7 _ → Number is 17x, where x is even.
- Sum of digits is 14 → 1 + 7 + x = 14 → x = 6
- So the number is 176
- Is it even? Yes (ends in 6). Between 100 and 200? Yes.

✔ Answer: 176

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Riddle 3:

> The sum of my three digits is 6.
> My hundreds digit is 2.
> The sum of my hundreds and tens digits is equal to my ones digit.
> What am I?

#### Step-by-step:
- Hundreds digit = 2
- Let tens digit = T, ones digit = O
- Sum of digits: 2 + T + O = 6 → T + O = 4
- Also: "Sum of hundreds and tens digits equals ones digit" → 2 + T = O
- Now substitute:
- From T + O = 4
- And O = 2 + T
- Plug into first equation: T + (2 + T) = 4 → 2T + 2 = 4 → 2T = 2 → T = 1
- Then O = 2 + 1 = 3
- So digits: 2 (hundreds), 1 (tens), 3 (ones) → 213
- Check: 2+1+3=6 ✔, 2+1=3 → equals ones digit ✔

✔ Answer: 213

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Riddle 4:

> I'm an even number.
> I'm >758 and <893.
> I'm a multiple of 100.
> What am I?

#### Step-by-step:
- Multiple of 100 between 758 and 893 → possible multiples of 100: 800
- 700 is too small (<758)
- 800 is within range (758 < 800 < 893)
- 900 is too big (>893)
- Is 800 even? Yes.
- So the number is 800

✔ Answer: 800

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✔ Final Answers:

1. 673
2. 176
3. 213
4. 800

Let me know if you'd like these explained in a visual or printable format!