Writing Number Sentences: Let's Add!

Math Grades 1st Grade 6:46 Video
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Lesson Description

Learn how to write number sentences (addition equations) using symbols and numbers to show how we add things together. Let's make math sentences!

Video Resource

Grade 1: Math Lesson # 21 Writing Addition Number Sentences

The Eagle's Nest - Our Online Classroom

Duration: 6:46
Watch on YouTube

Key Concepts

  • Number sentences (addition equations)
  • Addition symbol (+)
  • Equal sign (=)
  • Combining sets to find a total

Learning Objectives

  • Students will be able to write number sentences to represent addition problems.
  • Students will be able to identify and use the addition symbol (+) and the equal sign (=) correctly.
  • Students will be able to solve simple addition problems (within 10) using objects and number sentences.

Educator Instructions

  • Introduction (5 mins)
    Begin by explaining that today we're learning to write 'math sentences' using numbers and symbols. Show the class the addition (+) and equals (=) symbols and explain what they mean.
  • Guided Practice (10 mins)
    Watch the video 'Grade 1: Math Lesson # 21 Writing Addition Number Sentences'. Pause at each example (apple seeds, pumpkin seeds, flowers, leaves). Have students write the number sentence demonstrated in the video on their own paper. Discuss each part of the number sentence.
  • Independent Practice (10 mins)
    Give each student a set of small objects (e.g., counters, blocks, crayons). Call out simple addition problems (e.g., 'Put 2 blocks and then add 3 more blocks.'). Have the students arrange the objects and then write the corresponding number sentence. Repeat with different problems.
  • Wrap-up (5 mins)
    Review the key concepts: number sentences, addition symbol, and equal sign. Ask students to share one thing they learned today about writing number sentences.

Interactive Exercises

  • Object Addition
    Provide students with various small objects. Call out a number sentence (e.g., 3 + 2 = ?). Students use the objects to represent the numbers and solve for the total. Then they write the completed number sentence.
  • Draw and Add
    Give students worksheets with blank spaces for drawing. Provide a number sentence (e.g., 1 + 4 = ?). Students draw a picture to represent each number and then write the total.

Discussion Questions

  • What does the plus sign (+) mean?
  • What does the equal sign (=) mean?
  • Can you think of a time you added things together in your daily life?

Skills Developed

  • Writing number sentences
  • Understanding addition
  • Problem-solving
  • Symbol recognition

Multiple Choice Questions

Question 1:

What does the + sign mean?

Correct Answer: Add

Question 2:

What does the = sign mean?

Correct Answer: Equals

Question 3:

What is a number sentence?

Correct Answer: A group of numbers and symbols.

Question 4:

Which number sentence shows 2 + 1 = 3?

Correct Answer: 2 + 1 = 3

Question 5:

What is 1 + 1?

Correct Answer: 2

Question 6:

Which symbol do we use to show that we are adding?

Correct Answer: +

Question 7:

What number comes next in the number sentence: 3 + 2 = ?

Correct Answer: 5

Question 8:

If you have 4 apples and you get 1 more, how many do you have?

Correct Answer: 5

Question 9:

Which of these is a number sentence?

Correct Answer: 2 + 2 = 4

Question 10:

The = sign tells us the ______.

Correct Answer: Answer

Fill in the Blank Questions

Question 1:

A math sentence is also called a ______ sentence.

Correct Answer: number

Question 2:

We use the ______ sign to show we are adding.

Correct Answer: plus

Question 3:

The plus sign looks like this: ______

Correct Answer: +

Question 4:

The equal sign looks like this: ______

Correct Answer: =

Question 5:

2 + 2 = ______

Correct Answer: 4

Question 6:

1 + 3 = ______

Correct Answer: 4

Question 7:

4 + 0 = ______

Correct Answer: 4

Question 8:

3 + 1 = ______

Correct Answer: 4

Question 9:

The ______ sign means 'the same as'.

Correct Answer: equal

Question 10:

We write number sentences to show how many we have in ______.

Correct Answer: all

Educational Standards

CCSS.Math.Content.1.OA.A.1:Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. CCSS.Math.Content.1.OA.D.7: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. CCSS.Math.Content.1.OA.C.6:Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Teaching Materials

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