Exploring Extended Facts in Addition and Subtraction

This video tutorial for third graders covers lesson 2-1, focusing on extended facts in addition and subtraction. Students are guided through exercises using whiteboards and math journals to explore patterns in addition and subtraction. The lesson includes fact extensions and calculator practice to reinforce understanding of basic math concepts.

What is the sum of 5 plus 5?

• 15

• 5

• 11

• 10

What is the result of 9 plus 1?

• 11

• 12

• 9

• 10

If 8 plus 2 equals 10, what does 8 plus 3 equal?

• 9

• 12

• 10

• 11

If 9 minus 7 equals 2, what does 90 minus 70 equal?

• 22

• 20

• 2

• 200

What pattern is observed when subtracting numbers like 90 minus 70?

• The answer remains the same.

• The answer doubles.

• The answer is in the tens.

• The answer is in the hundreds.

What does 700 plus 900 equal?

• 160

• 900

• 700

• 1600

How does knowing 14 minus 9 helps in solving 24 minus 9?

• It has no impact.

• It changes the outcome.

• It helps in identifying the tens place.

• It indicates the difference in the ones place.

How does the concept of fact extensions help in solving larger problems?

• By changing the numbers completely.

• By applying basic facts to larger numbers.

• By reducing the numbers to single digits.

• By ignoring the tens and hundreds place.

What is the result of adding 7 to 33?

• 40

• 30

• 50

• 70

What is the result when changing 430 to 500 using addition?

• 430

• 500

• 70

• 570