SME
Grade 2 Math · Problem type
Two-step problems: subtract, then subtract
Use this for two-step problems where some go, twice.
Picture
Start 60, take away 18, then take away 25.
End 17.
After the first step: 42
This is an example. Type the numbers from your problem to start.
Start
example
Taken away first
example
After the first step
worked out
Taken away next
example
End
answer
Number sentences
42 = 60 − 18
17 = 42 − 25
Good to know
•
First some are taken away. Then some are taken away.
•
Do one step at a time. Find the middle amount first.
•
Every amount stays within 100.
Step-by-step
WE KNOW
Start: 60
Taken away first: 18
Taken away next: 25
FIND
after the first step, end
Step 1 · Find after the first step
? = 60 − 18
First: take away from the start.
5
10
6
0
−
1
8
4
2
60 − 10 = 50
50 − 8 = 42
After the first step: 42
Step 2 · Find end
? = 42 − 25
Then: take away from the middle amount.
3
12
4
2
−
2
5
1
7
42 − 20 = 22
22 − 2 = 20
20 − 3 = 17
End: 17
Check
Put the numbers back in. Both sides should match.
42 = 60 − 18 ✓
17 = 42 − 25 ✓
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