In this video, second graders learn about flip-flop facts, a math strategy where the order of numbers in an addition problem can be reversed without changing the sum. The teacher explains the concept using examples like 6 + 5 and 5 + 6, showing that both equal 11. Additional examples with 3 + 2 and 5 + 4 further illustrate the concept. The video emphasizes that this strategy works for any pair of numbers, making addition easier and more intuitive.

What is the main topic of today's math lesson?

• Division strategies

• Flip-flop facts in addition

• Multiplication tables

• Subtraction methods

Tags

CCSS.4.NBT.B.6

What does the term 'flip-flop facts' refer to in addition?

• Changing the order of numbers

• Using flip-flops to count

• Adding then subtracting numbers

• None of the above

Tags

CCSS.1.OA.B.3

If 6 plus 5 equals 11, what does 5 plus 6 equal?

• 10

• 12

• 11

• None of these

Tags

CCSS.1.OA.B.3

What strategy did the teacher use to solve 6 plus 5?

• Using a number line

• Counting on

• Making a model

• Guessing

Tags

CCSS.1.NBT.C.4

CCSS.2.MD.B.6

What is the result of 3 plus 2?

• 7

• 6

• 5

• 4

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

Does the order of numbers affect the result in addition?

• Only with large numbers

• No, never

• Yes, always

• Sometimes

Tags

CCSS.1.OA.B.3

What addition result did Miss Marquardt calculate using counting on?

• None of the above

• 2 plus 3 equals 5

• 3 plus 2 equals 5

• Both of the above

Tags

CCSS.1.OA.A.1

If 5 plus 4 equals 9, what does 4 plus 5 equal?

• 9

• 8

• 11

• 10

Tags

CCSS.1.OA.B.3

Which strategy did Miss Marquardt use to solve 5 plus 4?

• Using flip-flops

• Drawing a picture

• Counting on

• Using a calculator

Tags

CCSS.1.OA.A.1

What can be concluded about flip-flop facts in addition?

• They only work with even numbers

• They do not change the outcome

• They change the outcome

• They are unreliable

Tags

CCSS.1.OA.B.3