SME
Grade 2 Science · Problem type
Where the fresh water is
Use this to see where Earth’s fresh water is: ice, rivers and lakes, or under the ground.
Picture
69 + 1 + 30 = 100
This is an example. Type the numbers from your problem to start.
Cups in ice
example · cups
Cups in rivers and lakes
example · cups
Cups under the ground
answer · cups
Number sentences
69 + 1 + 30 = 100
Good to know
•
Most fresh water is frozen in ice. Much of the rest is under the ground.
•
Rivers and lakes hold only a little.
•
Picture all the fresh water as 100 cups: about 69 in ice, 30 under the ground, 1 in rivers and lakes.
Step-by-step
WE KNOW
Cups in ice: 69 cups
Cups in rivers and lakes: 1 cup
FIND
cups under the ground
Step 1 · Find cups under the ground
69 + 1 + ? = 100
Add the cups you know. Then count up to 100.
69 + 1 = 70
70 + 30 = 100
Cups under the ground: 30 cups
Check
Put the numbers back in. Both sides should match.
69 + 1 + 30 = 100 ✓
Topic check
See what you know: 5 questions on this topic
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