SME
Grade 2 Science · Problem type
Salty and fresh water
Use this for “97 of 100 cups are salty. How many are fresh?”
Picture
97 + 3 = 100
This is an example. Type the numbers from your problem to start.
Cups of salty water
example · cups
Cups of fresh water
answer · cups
Number sentences
97 + 3 = 100
Good to know
•
Most of Earth’s water is salty ocean water. Only a little is fresh.
•
Picture all of Earth’s water as 100 cups: 97 are salty and 3 are fresh.
•
Land plants, people and most animals need fresh water.
Step-by-step
WE KNOW
Cups of salty water: 97 cups
FIND
cups of fresh water
Step 1 · Find cups of fresh water
97 + ? = 100
All the water is 100 cups. Take away the salty cups.
100 − 97
97 + 3 = 100
Cups of fresh water: 3 cups
Check
Put the numbers back in. Both sides should match.
97 + 3 = 100 ✓
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