Explaining Addition Using Place Value

This lesson teaches how to explain addition using place value. It covers the importance of explaining math, using examples like the second and third grade milk problems. The lesson emphasizes breaking numbers into tens and ones, using base 10 blocks, and acting out problems to clarify solutions. It concludes with a summary of the key concepts learned.

What does the digit '2' represent in the number 26?

• 20

• 2 ones

• 200

• 2 tens

Why is it important to explain your math solutions?

• To show off your skills

• To prove you are correct and learn new strategies

• To confuse others

• To avoid doing homework

How can you visually represent the problem 12 + 4?

• Writing a story

• Drawing base 10 blocks

• Singing a song

• Using a calculator

How many milks were sold during the second grade lunch?

• 43

• 25

• 68

• 48

What is the first step in solving the second grade milk problem using place value?

• Subtract the smaller number from the larger one

• Add the ones and tens together

• Break apart the numbers into tens and ones

• Multiply the numbers

What is the total number of milks sold during the third grade lunch?

• 84

• 74

• 54

• 64

What must you do when you have 14 ones in the third grade milk problem?

• Leave them as they are

• Move 10 ones to the tens place

• Add them to the tens

• Ignore them