SME
Grade 6 Science · Earth & Space Science
Human impact on the environment
Use this for “Cutting each shower by 2 minutes, at 9 liters a minute, saves how much water in a year?”
Table
Days
Water saved
(L)
Time cut from each shower: 2 min
Water each minute: 9 L/min
This is an example. Type your own values to start a new problem.
m (min)
×
r (L/min)
=
d (L)
d (L)
×
n
days
=
w (L)
Formulas
2 × 9 = 18
Time cut × water each minute = water saved each day
18 × 365 = 6,570
Water saved each day × days = water saved
Assumptions
•
People use resources: water, energy, land. Using less of them is one way to lower our impact.
•
A shower uses about the same number of liters every minute.
Step-by-step
WE KNOW
Time cut from each shower: 2 min
Water each minute: 9 L/min
Days: 365
FIND
water saved each day, water saved
Step 1 · Find water saved each day
2 × 9 = ?
Time cut × water each minute = water saved each day
Each minute not showered saves that many liters.
Water saved each day = 18 L
Step 2 · Find water saved
18 × 365 = ?
Water saved each day × days = water saved
The same saving every day, so multiply by the days.
Water saved = 6,570 L
Check
Put the numbers back in. Both sides should match.
2 × 9 = 18 ✓
18 × 365 = 6,570 ✓
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Solutions that lower our impact
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