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Number Sentence: Definition and Example | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Number SentenceNumber Sentence: Definition and ExampleTable of ContentsDefinition of Number Sentences

A number sentence is a mathematical sentence composed of numbers and symbols that forms the foundation of mathematical communication. These sentences combine two expressions with a relational symbol (such as =, >, 15" is a proper number sentence, while "10 + 8 15" lacks meaning because it's missing the crucial relationship between the expressions.

Number sentences can utilize different mathematical operations including addition, subtraction, multiplication, and division to express relationships between quantities. They can be categorized as either true or false based on the mathematical relationship they represent. For instance, "5 + 3 = 8" is a true number sentence because the sum of 5 and 3 equals 8, while "4 × 2 = 10" would be a false number sentence since the product of 4 and 2 is 8, not 10.

Examples of Number Sentences Example 1: Determining Whether a Number Sentence is True or False Problem:

Determine whether the following sentence is true or false: 12+12+124×1212 + 12 + 12 12+12+124×12

Step-by-step solution:

Step 1, let's evaluate the left side of the inequality: 12+12+12=3612 + 12 + 12 = 3612+12+12=36

Step 2, let's calculate the right side of the inequality: 4×12=484 \times 12 = 484×12=48

Step 3, we compare the two values: Is 364836 3648? Yes, 36 is less than 48.

Step 4, the number sentence 12+12+124×1212 + 12 + 12 12+12+124×12 is true.

Example 2: Completing a Number Sentence Problem:

Complete the math sentence so that it is true: 6+7=9+‾6 + 7 = 9 + \underline{\hspace{0.5cm}}6+7=9+​

Step-by-step solution:

Step 1, calculate the value on the left side of the equation: 6+7=136 + 7 = 136+7=13

Step 2, determine what needs to be added to 9 to make the right side equal to 13: 9+‾=139 + \underline{\hspace{0.5cm}} = 139+​=13

Step 3, subtract 9 from both sides to find the missing number: ‾=13−9=4\underline{\hspace{0.5cm}} = 13 - 9 = 4​=13−9=4

Step 4, the completed number sentence is 6+7=9+46 + 7 = 9 + 46+7=9+4, which is true because both sides equal 13.

Example 3: Finding the Value of a Variable Problem:

Find the value of x so that the following sentence is true: x−24=10x - 24 = 10x−24=10

Step-by-step solution:

Step 1, recognize that we need to isolate the variable x on one side of the equation.

Step 2, to eliminate the subtraction of 24, we can add 24 to both sides of the equation: x−24+24=10+24x - 24 + 24 = 10 + 24x−24+24=10+24

Step 3, simplify both sides: x=34x = 34x=34

Step 4, verify our answer by substituting x = 34 back into the original equation: 34−24=1034 - 24 = 1034−24=10, which is true.

Step 5, x=34x = 34x=34 makes the number sentence true.

Comments(8)GGymnastUlyssesNovember 5, 2025I've used this clear def of number sentence with my students. It really helps them grasp basic math relationships. Thanks!

LLawyerGraceNovember 4, 2025I've been using this number sentence definition to teach my students. It's super clear and really helps them grasp the concept!

MCMs. CarterSeptember 17, 2025I’ve been using the number sentence examples from this page to help my kids with their math homework—it’s such a clear and simple way to explain equations! Definitely recommend it for parents or teachers.

NNatureLover87September 10, 2025This definition of a number sentence was super clear! I used the examples to help my kids understand their math homework, and it really clicked for them. Thanks for breaking it down so well!

MCMs. CarterAugust 27, 2025I’ve been using the number sentence examples from this page to help my kids with their homework, and it’s been a game-changer! The clear definitions made it so much easier to explain math concepts.

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