Subtraction Strategies and Concepts

Mrs. Garasi presents a Grade 2 math lesson focusing on subtraction and basic algebra concepts. She uses models and memory tricks to explain subtraction with and without regrouping. The lesson includes a story to aid understanding and introduces basic algebraic thinking. The video concludes with an introduction to multiplication through repeated addition.

What is the main purpose of Mrs. Garasi's video?

• To introduce a new math topic

• To review homework assignments

• To share vocabulary and memory tricks

• To teach new math problems

In problem number one, how many tens are drawn to model the number 84?

• Ten tens

• Eight tens

• Six tens

• Four tens

What memory trick is used for subtraction when there is more on top?

• More on top, subtract a lot

• More on top, no need to stop

• More on top, add some more

• More on top, go next door

What do you do when there is more on the floor in subtraction?

• Subtract directly

• Go next door and get 10 more

• Multiply the numbers

• Add more ones

What is the concept of 'borrowing' in subtraction compared to in the story?

• Borrowing a car

• Borrowing a pencil

• Borrowing an egg

• Borrowing a book

In the party analogy, what happens when you bring a 10 to the ones place?

• The ones place decreases

• The ones place increases

• The tens place increases

• The tens place decreases

What should you do if you have five ones and need to subtract all five?

• Regroup the tens

• Multiply the numbers

• Subtract directly

• Add more ones

What is the first step in solving a two-step subtraction problem?

• Divide the numbers

• Add the numbers

• Multiply the numbers

• Subtract the first number

How can you solve a problem by working backwards?

• By adding the numbers

• By thinking of what must be there initially

• By subtracting the numbers

• By multiplying the numbers

What is repeated addition a long way of doing?

• Division

• Subtraction

• Multiplication

• Addition