Variables · Math · f-strings · Modulo · Decimal formatting
Weight Converter
Use // (integer division) and % (modulo) to break total ounces
into tons, pounds, and ounces.
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Modulo % returns the remainder after division. So
3200 % 32000 gives you what's left over after removing full tons. Think of it like making change.
Inputs — adjust and watch the code update
3,200 oz
Python code
weight.py
Output
live result
// integer div% modulof"..." f-string
Commute Distance — Per Worker
Each worker lives a different distance from the office. Adjust the number of workers and
everyone gets a new random distance. Shows how Python would store each value in a variable and sum them up.
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Each worker = their own variable. In real Python you'd use a list for
this — but in Foundations we write each one out explicitly so you can see the pattern. Notice how the total uses
every individual variable added together.
Inputs
4
5
distances: 2 – 45 mi one-way
Worker roster — random distances
Python code
commute.py
Output
live result
* multiplyvariablesf"..." f-string:.1f decimal
Time Breakdown
A video render took N seconds. Break it into hours, minutes, and remaining seconds —
like a digital clock.
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Chaining // and % — first divide by 3600 to get hours, then take the
remainder % 3600 and divide that by 60 to get minutes, then % 60 for
leftover seconds.
Inputs
9,754 sec
Python code
time_break.py
Output
live result
// chained% chained
Bill Splitter
Split a lunch bill evenly. Use % to find the leftover cents that can't be
split perfectly. Introduces .2f formatting.
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f"{'{'}value:.2f{'}'}" — the :.2f inside an f-string
means "format as a float with exactly 2 decimal places." Essential for money. Without it, you might get
4.166666666.
Inputs
$23.47
4
Python code
bill_split.py
Output
live result
% remainder:.2f decimalf"..." f-string
Temperature Converter
Convert between Fahrenheit and Celsius. Shows how f-strings display results to a precise
number of decimal places — critical for scientific data.
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:.Nf controls precision.:.0f = no decimals,
:.1f = one decimal, :.4f = four decimals. Great for showing the difference between a
rough estimate vs. a precise measurement.
Inputs
98°F
Python code
temp_convert.py
Output — same number, different precision
live result
:.0f no decimals:.2f two decimals:.4f four decimals
Fuel Cost Calculator
How much does a road trip cost in gas? Combine division, multiplication, and f-string
decimal formatting for a real-world output.
Inputs
450 mi
28 mpg
$3.49
Python code
fuel_cost.py
Output
live result
/ float division* multiply:.2f money
f-string Formatting Reference
A hands-on guide to all the most useful f-string format specs. Adjust the number and see
how each format code changes the output.