Mastering Addition and Subtraction with 9's Techniques

The video tutorial introduces the concept of adding 9 to single-digit numbers, explaining that the result is the number before the added digit with a 1 in front. It provides examples with numbers 1, 2, 6, and 9, demonstrating the pattern. A rhyme is introduced to help remember the rule: take the number, subtract one, and place a 1 in front. The video emphasizes repetition and pattern recognition to reinforce learning.

What is the result of adding 9 to a single-digit number?

• The sum is always 10

• The sum is the next number with a 0 at the end

• The sum is the previous number with a 1 in front

• The sum is always more than 10

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CCSS.2.NBT.B.5

What is 9 plus 1?

• 9

• 10

• 12

• 11

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CCSS.1.OA.C.6

CCSS.2.OA.B.2

What is 9 plus 2?

• 10

• 13

• 12

• 11

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CCSS.1.OA.C.6

CCSS.2.OA.B.2

How do you find the sum of 9 and 6?

• By subtracting 1 from 6 and adding a 1 in front

• By adding 1 to 6

• By dividing 9 by 6

• By multiplying 9 and 6

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CCSS.1.OA.A.1

What is the sum of 9 and 9?

• 17

• 20

• 18

• 19

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CCSS.1.OA.C.6

CCSS.2.OA.B.2

What is the key step in the rhyme for adding 9?

• Multiply the number by 9

• Subtract 1 from the number and add a 1 in front

• Divide the number by 9

• Add 1 to the number

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CCSS.3.OA.D.9

What is 9 plus 3 according to the rhyme?

• 11

• 12

• 13

• 14

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CCSS.1.OA.A.1

What is 9 plus 7 as per the rhyme?

• 15

• 16

• 17

• 18

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CCSS.1.OA.A.1

What does the rhyme suggest about adding 9 to a number?

• It requires advanced mathematical skills

• It's unpredictable

• It's a simple process once you know the trick

• It's always a complex process

Tags

CCSS.3.OA.D.9

According to the video, what is the sum of 9 plus 8?

• 18

• 19

• 17

• 16

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CCSS.1.OA.A.1