Making Ten: Adding 8 + 7!

Math Grades 1st Grade 3:19 Video
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Lesson Description

Let's learn how to add 8 + 7 by making a group of ten! We'll use tomatoes and blueberries to help us understand.

Video Resource

Adding 8 + 7 | Addition and subtraction within 20 | Early Math | Khan Academy

Khan Academy

Duration: 3:19
Watch on YouTube

Key Concepts

  • Making a ten
  • Addition within 20
  • Place value (tens and ones)

Learning Objectives

  • Students will be able to add numbers within 20 by using the strategy of making a ten.
  • Students will be able to identify the tens and ones place in teen numbers.

Educator Instructions

  • Introduction (5 mins)
    Begin by asking students what they know about adding. Review what 'plus' means. Show the YouTube video 'Adding 8 + 7 | Addition and subtraction within 20 | Early Math | Khan Academy'. Tell them to watch how the person in the video adds 8 and 7 using tomatoes and blueberries.
  • Discussion (5 mins)
    After the video, discuss what they saw. Ask them how the person in the video made a ten. Emphasize the steps: filling up one group to make ten, then adding the leftover ones.
  • Activity: Making Ten with Objects (15 mins)
    Give each student a set of counters (e.g., beans, blocks). Write '8 + 7' on the board. Guide them to put out 8 counters, then add counters until they have 10. Ask, "How many more did you need to make 10?" Then, ask, "How many counters are left over?" Combine the ten and the leftovers to find the total (15).
  • Practice Problems (10 mins)
    Write more addition problems on the board that require making ten (e.g., 9 + 6, 7 + 5, 8 + 4). Have students use their counters to solve each problem, showing how they make ten each time.
  • Wrap-up (5 mins)
    Review what they learned about making ten. Ask students to explain in their own words how this strategy helps them add bigger numbers. Recap the concept of representing numbers as tens and ones.

Interactive Exercises

  • Ten Frame Addition
    Provide students with ten frame templates. Have them represent the addition problem (e.g., 8+7) by filling in one ten frame with 8 counters and another with 7. Then, guide them to move counters from the second frame to the first to complete the ten, visually demonstrating 'making ten'.

Discussion Questions

  • What does it mean to 'make a ten' when adding?
  • How does making a ten help us add bigger numbers faster?
  • Can you think of other times when making ten might be helpful?

Skills Developed

  • Addition strategies
  • Number sense
  • Problem-solving

Multiple Choice Questions

Question 1:

What is 8 + 7?

Correct Answer: 15

Question 2:

To make a ten with 8, how many more do you need?

Correct Answer: 3

Question 3:

If you have 10 and add 5 more, how many do you have in all?

Correct Answer: 15

Question 4:

Which numbers are we adding in the video?

Correct Answer: 8 + 7

Question 5:

Which one of these shows how to make 10 from 7?

Correct Answer: 7 + 3

Question 6:

What fruits are used in the video to show adding?

Correct Answer: Tomatoes and Blueberries

Question 7:

The number 15 has 1 in the tens place. What does that 1 really mean?

Correct Answer: 10 ones

Question 8:

How many blueberries were LEFT OVER after making ten with the tomatoes?

Correct Answer: 5

Question 9:

What does PLUS mean?

Correct Answer: Adding More

Question 10:

If you know that 8 + 2 = 10, and you want to add 8 + 3, what would you do?

Correct Answer: Add one to 10

Fill in the Blank Questions

Question 1:

We can add 8 + 7 by making a group of ______.

Correct Answer: ten

Question 2:

In the number 15, the 5 is in the _______ place.

Correct Answer: ones

Question 3:

8 plus 7 equals _______.

Correct Answer: 15

Question 4:

To make 10 out of 8, you need to add _______.

Correct Answer: 2

Question 5:

The video uses tomatoes and _______ to show adding.

Correct Answer: blueberries

Question 6:

The number 15 means 1 group of ten and _____ ones.

Correct Answer: 5

Question 7:

Adding means putting things ________.

Correct Answer: together

Question 8:

If I start with 9 and add 1, I made a ________.

Correct Answer: ten

Question 9:

If you have 10 and 3, you have ____.

Correct Answer: 13

Question 10:

15 is bigger than 10 by ________.

Correct Answer: 5

Educational Standards

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). CCSS.Math.Content.1.NBT.B.2.B:The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. 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.

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