First Grade Math: Adding and Subtracting Multiples of Ten

The video tutorial covers first grade module six, lesson ten, focusing on adding and subtracting multiples of ten up to one hundred. It introduces the concept of unit form and standard form, using examples like 40 plus 30 equals 70. The lesson emphasizes understanding over memorization, encouraging students to think in terms of units, such as tens, and apply this understanding to both addition and subtraction. The tutorial also provides strategies for scaffolding and practice, ensuring students grasp the concepts before moving to standard algorithms.

What is the main focus of this lesson?

• Learning about fractions

• Multiplying and dividing by 10

• Adding and subtracting multiples of 10 up to 100

• Adding and subtracting single digits

If 4 ones plus 3 ones equals 7 ones, what does 4 tens plus 3 tens equal?

• 70

• 50

• 40

• 30

What is the unit form of 40 plus 30?

• 4 tens plus 3 tens

• 70

• 40 plus 30

• 4 plus 3

How can subtraction be introduced using unit form?

• Using tens as units

• Using apples as units

• Using ones as units

• Using hundreds as units

What is the result of 90 minus 30 in unit form?

• 30

• 60

• 6 tens

• 9 tens

In the visual representation, what does crossing off three tens from nine tens represent?

• Addition

• Multiplication

• Subtraction

• Division

What is the standard form of 7 dimes minus 2 dimes?

• 50

• 70

• 5

• 20

What is the result of 70 plus 30?

• 90

• 100

• 60

• 80

How should teachers help students struggling with a problem?

• Repeat the previous lesson

• Scaffold using unit form

• Use smaller numbers

• Skip the problem

What is the goal of this lesson?

• Teach standard algorithms

• Introduce algebra

• Ensure general understanding of the concept

• Focus on memorization