Doubles Plus One: Becoming Addition Superstars!

Math Grades 1st Grade 7:08 Video
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Lesson Description

Learn how to use doubles facts to quickly solve addition problems with numbers that are right next to each other! We'll use fun strategies to become addition superstars!

Video Resource

Grade 1: Math Lesson #78 Addition Facts - Doubles Plus One Facts

The Eagle's Nest - Our Online Classroom

Duration: 7:08
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Key Concepts

  • Doubles facts
  • Doubles plus one facts
  • Addition strategies

Learning Objectives

  • Students will be able to identify doubles plus one addition facts.
  • Students will be able to use doubles facts to solve doubles plus one addition problems.
  • Students will be able to explain the strategy of 'doubles plus one' for addition.

Educator Instructions

  • Introduction (5 mins)
    Begin by reviewing simple addition facts, including doubles facts (1+1, 2+2, 3+3, etc.). Ask students what they notice about these facts. Explain that today we are learning about 'doubles plus one' facts!
  • Video Viewing (7 mins)
    Watch the video 'Grade 1: Math Lesson #78 Addition Facts - Doubles Plus One Facts' (https://www.youtube.com/watch?v=WUlLcdjz418). Pause at key points to ask questions and ensure understanding.
  • Guided Practice (10 mins)
    Write several 'doubles plus one' problems on the board (e.g., 4+5, 6+7, 2+3). For each problem, guide the students through the process of identifying the smaller number, doubling it, and then adding one. Use manipulatives (like blocks or counters) to help them visualize the process.
  • Independent Practice (10 mins)
    Give students a worksheet with 'doubles plus one' problems to solve independently. Encourage them to use the strategy they learned in the guided practice. Provide support as needed.
  • Wrap-up (3 mins)
    Review the key concepts of the lesson. Ask students to explain in their own words how to solve a 'doubles plus one' problem. Preview upcoming math topics.

Interactive Exercises

  • Number Line Hop
    Use a number line. Start at the smaller number in the 'doubles plus one' problem. First, hop to the double. Then, hop one more space. What number did you land on?
  • Domino Doubles
    Use dominoes! Pick a domino where the numbers on each side are one apart (e.g., 3 and 4). Use the strategy to figure out what the domino adds up to.

Discussion Questions

  • What is a 'doubles fact'?
  • How can knowing your doubles facts help you solve other addition problems?
  • Can you think of a time when you used 'doubles plus one' without even realizing it?

Skills Developed

  • Addition fluency
  • Problem-solving strategies
  • Number sense

Multiple Choice Questions

Question 1:

What is 3 + 3?

Correct Answer: 6

Question 2:

What is 4 + 5? Think: What is 4 + 4, then add one more!

Correct Answer: 9

Question 3:

Which one is a doubles fact?

Correct Answer: 1 + 1

Question 4:

What is 6 + 7? Think: What is 6 + 6, then add one more!

Correct Answer: 13

Question 5:

What is 2 + 3? Think: What is 2 + 2, then add one more!

Correct Answer: 5

Question 6:

When we do doubles plus one, what do we do first?

Correct Answer: Double the smaller number

Question 7:

What number is one more than 7?

Correct Answer: 8

Question 8:

What is 5 + 6? Think: What is 5 + 5, then add one more!

Correct Answer: 11

Question 9:

Which of these is a 'doubles plus one' problem?

Correct Answer: 1 + 2

Question 10:

What is 7 + 8? Think: What is 7 + 7, then add one more!

Correct Answer: 15

Fill in the Blank Questions

Question 1:

2 + 2 is a ______ fact.

Correct Answer: doubles

Question 2:

To solve 3 + 4, we can double the smaller number, which is ____.

Correct Answer: 3

Question 3:

3 + 3 = ____

Correct Answer: 6

Question 4:

If 3 + 3 = 6, then 3 + 4 = ____

Correct Answer: 7

Question 5:

5 + 5 = ____

Correct Answer: 10

Question 6:

If 5 + 5 = 10, then 5 + 6 = ____

Correct Answer: 11

Question 7:

The numbers in doubles plus one are right ________ to each other.

Correct Answer: next

Question 8:

In 1 + 2, the smaller number is ____

Correct Answer: 1

Question 9:

The answer to 4 + 5 is _____

Correct Answer: 9

Question 10:

To do doubles plus one, we double the ________ number and add one.

Correct Answer: smaller

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.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.) 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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