Understanding Tens and Subtraction

The video tutorial explains how to perform addition and subtraction using the concept of tens. It begins by demonstrating how to add numbers by breaking them into tens, showing that 60 plus 30 equals 90 by understanding 60 as six tens and 90 as nine tens. The tutorial then moves on to subtraction, illustrating that 80 minus 40 equals 40 by recognizing 80 as eight tens and 40 as four tens. The video reinforces these concepts with another example, showing that 90 minus 60 equals 30 by understanding the tens involved.

If 60 is represented as six tens, how many tens do you need to add to reach 90?

• Four tens

• Three tens

• Two tens

• Five tens

What is the result of subtracting 60 from 90 using the concept of tens?

• Two tens

• Three tens

• Five tens

• Four tens

How many tens are there in 80?

• Nine tens

• Eight tens

• Seven tens

• Six tens

What is the result of subtracting 40 from 80 using the concept of tens?

• Five tens

• Two tens

• Three tens

• Four tens

If 40 is represented as four tens, what is 80 minus 40?

• Twenty

• Forty

• Fifty

• Thirty

How many tens are there in 90?

• Nine tens

• Eight tens

• Seven tens

• Six tens

What is another way of writing three tens?

• Thirty

• Twenty

• Fifty

• Forty

What is the result of subtracting 60 from 90, revisiting the concept of tens?

• Twenty

• Thirty

• Forty

• Fifty

If 60 is six tens, what is 90 minus 60?

• Twenty

• Thirty

• Fifty

• Forty

What is another way of expressing the subtraction of 60 from 90?

• Four tens

• Three tens

• Two tens

• Five tens