Final answer:
To find 55% of 800, you calculate 50% of 800, which is 400, then find 5% by halving 10% of 800, resulting in 40, and add them together to get 440.
Step-by-step explanation:
To find 55% of 800 using the idea of halves, we can break it down using the bar model.
First, find 50% of 800, which is half of 800.
Knowing that half of 800 is 400, we can then find 5% by taking half of 10% (since 5% is half of 10%).
We calculate 10% of 800 by dividing 800 by 10, which gives us 80.
Therefore, 5% is half of 80, which is 40. Now, we add the 50% and the additional 5% together to get 55%: 400 + 40 = 440. So, 55% of 800 students is 440 students.