Adjusting Numbers for Addition and Subtraction

The video tutorial focuses on lesson 28, teaching strategies for adjusting numbers in addition and subtraction. It includes examples of solving word problems, adjusting equations, and using number lines to find differences. The teacher emphasizes understanding different strategies and checking work using traditional methods.

What is the main purpose of adjusting numbers in addition and subtraction?

• To confuse the students

• To change the final result

• To simplify calculations

• To make calculations more complex

In the word problem about fans, what is the first step in adjusting the addends?

• Multiply both addends by two

• Subtract one from both sides

• Add one to both sides

• Take one from one addend and add it to the other

Why does the teacher not prefer adjusting subtraction equations?

• It makes the problem more difficult

• It is not a valid mathematical strategy

• It confuses the teacher

• It changes the final answer

What mistake did Marco make in his strategy for adjusting numbers?

• He subtracted from both sides

• He added to both sides

• He did not change any numbers

• He multiplied both numbers

When adjusting numbers in addition, what must be done to maintain the same total?

• Add to one number and subtract from the other

• Subtract from both numbers

• Multiply both numbers

• Add to both numbers

In the practical examples, what is the result of adjusting 398 + 147?

• 525

• 535

• 555

• 545

What is the key concept when using a number line for subtraction?

• Finding the product

• Finding the difference

• Finding the quotient

• Finding the sum

How can you adjust 236 - 119 to make the calculation easier?

• Add 1 to one number and subtract 1 from the other

• Add 1 to both numbers

• Subtract 10 from both numbers

• Add 10 to both numbers

What is the correct adjustment for the equation 109 + 119 to maintain the same total?

• 109 + 120

• 110 + 120

• 108 + 118

• 110 + 118

Why is it important to check your math using different methods?

• To ensure accuracy

• To impress others

• To confuse yourself

• To waste time