Solve the Addition Equation: Finding the Missing Number in 24 + □ = 31

To solve this problem using a number line and two jumps, follow these steps:

• Start at 24 on the number line.
• The first jump will move us to the nearest convenient round number, which is 30. This jump is $30 - 24 = 6$.
• From 30, we need to jump to 31. The second jump is $31 - 30 = 1$.
• Add the two jumps together: $6 + 1 = 7$.

Therefore, the number that fills the gap $\Box$ in the equation $24 + \Box = 31$ is $7$.