SME
Grade 3 Science · Problem type
Which birds survived the dry year?
Use this for “27 big-beaked and 8 small-beaked birds survived the dry year. How many more big-beaked birds survived?”
Chart
27
8
More survived: 19
This is an example. Type your own values to start a new problem.
Big-beaked birds that survived
example
Small-beaked birds that survived
example
More survived
calculated
Formulas
27 and 8 are 19 apart
Difference between big-beaked birds that survived and small-beaked birds that survived = more survived
Assumptions
•
In a dry year only hard seeds are left. Birds with big strong beaks can crack them.
•
Count the birds of each kind that survived.
Step-by-step
WE KNOW
Big-beaked birds that survived: 27
Small-beaked birds that survived: 8
FIND
more survived
Step 1 · Find more survived
27 and 8 are ? apart
Difference between big-beaked birds that survived and small-beaked birds that survived = more survived
Take the smaller number away from the bigger one.
More survived = 27 − 8
27 − 7 = 20
20 − 1 = 19
More survived = 19 (more big-beaked birds survived)
Check
Put the numbers back in. Both sides should match.
27 − 8 = 19 ✓
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