SME
Grade 3 Math · Problem type
Two-step problems: addition and subtraction
Use this for “had 215, got 60 more, then gave away 120: how many are left?”
Diagram
Start 215, add 60, then take away 120.
End 155.
This is an example. Type your own values to start a new problem.
Start
+
Added
−
Taken away
=
Left
Total after adding
worked out (not typed)
Formulas
215 + 60 = 275
Start + added = total after adding
275 − 120 = 155
Total after adding − taken away = left
Assumptions
•
Do the steps in the order the story tells them: add first, then take away.
•
The total after adding is the start for taking away.
•
Numbers to 1,000.
Step-by-step
WE KNOW
Start: 215
Added: 60
Taken away: 120
FIND
total after adding, left
Step 1 · Find total after adding
215 + 60 = ?
Start + added = total after adding
First step: add what was added to the start.
Total after adding = 275
Step 2 · Find left
275 − 120 = ?
Total after adding − taken away = left
Second step: take away from the total.
275 − 100 = 175
175 − 20 = 155
Left = 155
Check
Put the numbers back in. Both sides should match.
215 + 60 = 275 ✓
275 − 120 = 155 ✓
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Two-step problems: multiply, then compare
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Patterns in addition and multiplication tables
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