Welcome to elementary math olympiad problems! Today we'll explore challenging problems for grades one through four. Let's start with Grade 1 problems. The first problem is about pattern recognition: find the missing numbers in the sequence 2, 4, 6, 8. The second problem involves simple logic about three children racing.
Now let's move to Grade 2 problems, which are more challenging. The first problem involves sum and difference: two numbers add up to 15 and their difference is 3. We can solve this by adding the equations to get 2a equals 18, so a equals 9 and b equals 6. The second problem is about ages: when will a 35-year-old dad be 4 times his 8-year-old son's age? The answer is in 3 years.