SME
Grade 2 Math · Problem type
Solve addition and subtraction word problems
Use this for “Leo adds 16 books to a cart. Now there are 43. How many were there before?” and “How many did he add?”
Picture
45 + 27 = 72
This is an example. Type the numbers from your problem to start.
First part
+
Second part
=
Whole
Number sentences
45 + 27 = 72
Good to know
•
Draw one bar for the whole and cut it into the two parts.
•
To find the whole, add the parts. To find a part, take the other part away.
•
Example: 72 stickers, 45 are stars. How many are not stars? 72 − 45 = 27.
Step-by-step
WE KNOW
Whole: 72
First part: 45
FIND
second part
Step 1 · Find second part
45 + ? = 72
Count up from the known part to the whole.
72 − 45
6
12
7
2
−
4
5
2
7
45 + 5 = 50
50 + 20 = 70
70 + 2 = 72
Jumps: 5 + 20 + 2 = 27
Second part: 27
Check
Put the numbers back in. Both sides should match.
45 + 27 = 72 ✓
Topic check
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