1.OA.7: Understand the Equal Sign
Also written as 1.OA.D.7 and CCSS.MATH.CONTENT.1.OA.D.7 · Cluster: Work with addition and subtraction equations.
The Official Wording
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 - 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.
Common Core State Standards, Grade 1, Operations & Algebraic Thinking · Read it at the source · Checked October 14, 2026
What 1.OA.7 Means in Plain English
First graders learn that = means “is the same amount as”, not “the answer comes next”. They sort equations into true and false, with the total first, like 9 = 4 + 5, or with work on both sides, like 3 + 6 = 5 + 4.
A child who reads = as “now write the answer” calls 9 = 4 + 5 backwards, so balance pictures and cube towers matter. In 2nd grade students write even numbers as doubles like 10 = 5 + 5 (2.OA.3), and every later equation leans on this reading.
1.OA.7 I Can Statements
- I can explain that = means the same amount.
- I can tell if an equation is true or false.
- I can read an equation with the total on the left.
1.OA.7 Worked Example
Two equations judged the way the standard intends: work out each side on its own, then compare.
Is 3 + 6 = 5 + 4 true or false? Is 8 = 10 - 3 true or false?
- The equal sign says both sides are the same amount. Work out each side on its own.3 + 6 = 5 + 4
- Left side first.left: 3 + 6 is 9
- Now the right side.right: 5 + 4 is 9
- Both sides are 9, so the equation is true.9 and 9: true
- Now 8 = 10 - 3. The left side is 8 and the right side is 7. Not the same amount, so it is false.8 and 7: false
Check it: Build each side as a cube tower. A true equation makes two towers of the same height, and the 8 tower stands one cube taller than the 7.
Common Mistakes with 1.OA.7
Reading = as “the answer comes next”
Calls 9 = 4 + 5 false because “it’s backwards”
Try this: Put the same cubes on a pan balance both ways round and ask what changed: nothing, so 9 = 4 + 5 is true.
Running the equation on
3 + 4 = 7 + 2 marked true because 3 + 4 = 7
Try this: Cover the right side, find the left amount, then cover the left and find the right. Only matching amounts make it true.
Rejecting an equation with no plus or minus
Says 7 = 7 is “not a real one”
Try this: Include equations with no operation, like 7 = 7, in every true-or-false sort so students meet them as ordinary facts.
Where 1.OA.7 Fits
Practice 1.OA.7
Quick Check
- True or false: 10 = 6 + 4
- True or false: 5 + 3 = 4 + 2
- True or false: 9 - 2 = 3 + 4