Grade 6 · Find a percent of a whole · 64 of 750
Find a percent of a whole · practice 7
Find 80% of 200. Follow the calculation, then test the quantities in the animated example.
Try the question, use a hint when you need one, and compare your reasoning with the worked solution. The animation starts with this chapter’s values; changing its controls explores a new case.
01 · Make a prediction
Your practice question
Find 80% of 200.
Use this scratch space or work on paper. Your notes stay on this page and clear when you leave. Answers are for self-checking; they are not automatically graded.
A starting point
Use the original whole and write the percentage as a fraction of 100.
Work through the reasoning
Step 1
Translate the givens
The reference whole is 200; 80% = 80/100 = 0.8.
Step 2
Calculate with the model
The requested part is 200 × 80/100 = 160.
Step 3
Check and interpret
The part-to-whole ratio is 160/200 = 80/100. Multiplying that ratio by 100 recovers 80%.
The answer
160.
Compare the method as well as the result. A different valid method may reach the same answer. Keep exact values until the last step when the question asks for rounding.
02 · Explore the model
See the mathematical relationship move.
Use Play, Pause, and the timeline to inspect the construction. Reset restores the question’s original settings. The displayed assumptions describe where this model applies.
Watch the relationship
PausedHD animation studio
From experiment to screen.
Present a crisp Canvas scene, save a full-HD image, or capture your model as a silent video.
The mathematical idea
A percentage is a ratio to one hundred. Multiplying a whole by p/100 gives the part associated with p percent. The original whole remains the reference quantity even when the highlighted part grows during playback. Starting quantities: Original whole = 200; Percent of whole = 80.
part = whole × percent / 100
03 · Reflect and transfer
Explain what changes and why.
Why must the reference whole be identified before finding a percent?
This is a distinct guided scenario using a reusable mathematical model. Similar-looking diagrams can represent different given values and conclusions; they are not different mathematical theories.