SME
Grade 2 Math · Problem type
Two-step problems: subtract, then add
Use this for two-step problems: some go, then some come.
Picture
Start 50, take away 15, then add 20.
End 55.
After the first step: 35
This is an example. Type the numbers from your problem to start.
Start
example
Taken away first
example
After the first step
worked out
Added next
example
End
answer
Number sentences
35 = 50 − 15
55 = 35 + 20
Good to know
•
First some are taken away. Then some are added.
•
Do one step at a time. Find the middle amount first.
•
Every amount stays within 100.
Step-by-step
WE KNOW
Start: 50
Taken away first: 15
Added next: 20
FIND
after the first step, end
Step 1 · Find after the first step
? = 50 − 15
First: take away from the start.
4
10
5
0
−
1
5
3
5
50 − 10 = 40
40 − 5 = 35
After the first step: 35
Step 2 · Find end
? = 35 + 20
Then: add to the middle amount.
35 + 20 = 55
End: 55
Check
Put the numbers back in. Both sides should match.
35 = 50 − 15 ✓
55 = 35 + 20 ✓
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