SME
Grade 3 Math · Problem type
Two-step problems: add, then divide
Use this for “18 red and 12 blue beads, shared equally on 5 strings. How many on each?”
Diagram
18 + 12 = 30.
30 ÷ 5 = 6 in each group.
First amount: 18
Second amount: 12
This is an example. Type your own values to start a new problem.
(
First amount
+
Second amount
)
÷
Groups
=
In each group
Total
calculated
Formulas
18 + 12 = 30
First amount + second amount = total
5 × 6 = 30
Groups × in each group = total
Assumptions
•
First add to find the total. Then share the total equally.
•
Every group gets the same number, with none left over.
Step-by-step
WE KNOW
Groups: 5
First amount: 18
Second amount: 12
FIND
total, in each group
Step 1 · Find total
18 + 12 = ?
First amount + second amount = total
Add the first amount and the second amount.
1
1
8
+
1
2
3
0
Total = 30
Step 2 · Find in each group
5 × ? = 30
Groups × in each group = total
Divide the total by the groups.
In each group = 30 ÷ 5
Think: 5 × ? = 30
5 × 5 = 25
One more group: 25 + 5 = 30
6 groups of 5 make 30
In each group = 6
Check
Put the numbers back in. Both sides should match.
18 + 12 = 30 ✓
5 × 6 = 30 ✓
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Related lessons
Solve two-step word problems
Main lesson
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