Doubles Plus One: Adding Made Easy!

Math Grades 1st Grade 4:52 Video
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Lesson Description

Learn how to use doubles facts to solve addition problems quickly! This lesson focuses on 'doubles plus one' strategies to help you add numbers like 3+4 or 5+6 with confidence.

Video Resource

Grade 1: Math Lesson #76 Addition Facts - Showing Doubles Plus One Facts

The Eagle's Nest - Our Online Classroom

Duration: 4:52
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Key Concepts

  • Doubles facts (e.g., 2+2, 5+5)
  • Adding one more to a doubles fact
  • Using known doubles facts to solve 'doubles plus one' problems

Learning Objectives

  • Students will be able to identify doubles facts.
  • Students will be able to add one to a doubles fact.
  • Students will be able to use doubles facts to solve doubles plus one addition problems.

Educator Instructions

  • Introduction (5 mins)
    Start by reviewing doubles facts (1+1, 2+2, 3+3, etc.) Ask students to shout out the answers. Connect this to the video by saying, 'In the video, we'll see how knowing these doubles facts can help us solve other addition problems really easily!'
  • Video Viewing (7 mins)
    Watch the video 'Grade 1: Math Lesson #76 Addition Facts - Showing Doubles Plus One Facts'. Encourage students to pay attention to how the teacher uses towers/trains to represent the numbers.
  • Guided Practice (10 mins)
    After the video, work through some examples together on the board. Use drawings or manipulatives (like blocks or counters) to show the 'doubles plus one' concept. For example: 'We know 3+3 is 6. What is 3+4? It's just one more than 6!'
  • Independent Practice (8 mins)
    Give students a worksheet or have them work in pairs to solve 'doubles plus one' problems. Include problems like 2+3, 4+5, 6+7. Encourage them to use drawings or manipulatives if needed.

Interactive Exercises

  • Building Towers
    Provide students with blocks or LEGO bricks. Have them build two equal towers (a doubles fact). Then, have them add one brick to one of the towers and find the new total.
  • Number Line Jump
    Use a number line. Start at a number. Jump to add the double, then jump one more space to add the 'plus one'.

Discussion Questions

  • What are some doubles facts you already know?
  • How can knowing 5+5 help you solve 5+6?
  • Can you think of a time when you used doubles plus one in real life?

Skills Developed

  • Addition fluency
  • Problem-solving
  • Visual representation of numbers

Multiple Choice Questions

Question 1:

What is 2 + 2?

Correct Answer: 4

Question 2:

If you know 3 + 3 = 6, what is 3 + 4?

Correct Answer: 7

Question 3:

What is 5 + 5?

Correct Answer: 10

Question 4:

If you know 5 + 5 = 10, what is 5 + 6?

Correct Answer: 11

Question 5:

What is 1 + 1?

Correct Answer: 2

Question 6:

If you know 6 + 6 = 12, what is 6 + 7?

Correct Answer: 13

Question 7:

What is 4 + 4?

Correct Answer: 8

Question 8:

If you know 4 + 4 = 8, what is 4 + 5?

Correct Answer: 9

Question 9:

What doubles fact helps you solve 2 + 3?

Correct Answer: 2 + 2

Question 10:

Which is an example of doubles plus one?

Correct Answer: 4 + 5

Fill in the Blank Questions

Question 1:

3 + 3 = ____

Correct Answer: 6

Question 2:

2 + 2 = ____

Correct Answer: 4

Question 3:

If 4 + 4 = 8, then 4 + 5 = ____

Correct Answer: 9

Question 4:

5 + 5 = ____

Correct Answer: 10

Question 5:

If 1 + 1 = 2, then 1 + 2 = ____

Correct Answer: 3

Question 6:

If 6 + 6 = 12, then 6 + 7 = ____

Correct Answer: 13

Question 7:

10 + 10 = ____

Correct Answer: 20

Question 8:

A doubles plus one fact is like a doubles fact, but with ____ more.

Correct Answer: 1

Question 9:

7 + 7 = ____

Correct Answer: 14

Question 10:

If 7 + 7 = 14, then 7 + 8 = ____

Correct Answer: 15

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.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.B.3:Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

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