Find the odd one out: 64 – 8, 36 – 6, 49 – 7, 80

Find the odd one out: 64 – 8, 36 – 6, 49 – 7, 80 – 9

64 – 8

36 – 6

49 – 7

80 – 9

Let's analyze each pair:

1. 64 - 8: 64 = 8², and 8 = 8 (matches)

2. 36 - 6: 36 = 6², and 6 = 6 (matches)

3. 49 - 7: 49 = 7², and 7 = 7 (matches)

4. 80 - 9: 80 ≠ 9² (doesn't match, as 9² = 81)

The odd one out is 80 - 9 because the other pairs consist of a number and its square root.