SME
Grade 2 Math · Problem type
Add up to four two-digit numbers
Use this for “Find the value of 15 + 15 + 20 + 5.”
Picture
Rods are tens, small cubes are ones.
This is an example. Type the numbers from your problem to start.
First
+
Second
+
Third
+
Fourth
=
Total
Number sentences
23 + 15 + 32 + 17 = 87
Good to know
•
Add all the tens. Then all the ones. Look for ones that make a ten.
•
In 23 + 17, the 3 and the 7 make a ten.
Step-by-step
WE KNOW
First: 23
Second: 15
Third: 32
Fourth: 17
FIND
total
Step 1 · Find total
23 + 15 + 32 + 17 = ?
Add all the tens, then all the ones. Trade 10 ones for a ten.
1
2
3
+
1
5
+
3
2
+
1
7
8
7
Tens: 20 + 10 + 30 + 10 = 70
Ones: 3 + 7 = 10, then 10 + 5 + 2 = 17
17 ones = 1 ten and 7 ones
Total: 87
Check
Put the numbers back in. Both sides should match.
23 + 15 + 32 + 17 = 87 ✓
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