The video tutorial introduces and practices double facts and the doubles plus one strategy. It begins with a song to help memorize double facts, followed by a quiz to test speed and accuracy. The doubles plus one strategy is then introduced, explaining how to add numbers that are neighbors on the number line by doubling the smaller number and adding one. The video includes several examples to reinforce the concept.

What is the sum of 1 plus 1?

• 4

• 3

• 2

• 1

What is the result of adding 2 plus 2?

• 3

• 2

• 4

• 5

How much is 3 plus 3?

• 7

• 6

• 5

• 8

What do you get when you add 4 plus 4?

• 7

• 8

• 9

• 6

Calculate the sum of 5 plus 5.

• 9

• 10

• 12

• 11

What is 6 plus 6?

• 12

• 13

• 11

• 10

Find the result of 7 plus 7.

• 15

• 14

• 13

• 12

What is the sum of 8 plus 8?

• 16

• 15

• 14

• 17

How much is 9 plus 9?

• 16

• 17

• 19

• 18

What do you get when you add 10 plus 10?

• 18

• 19

• 20

• 21