Subtracting Tens in Three-Digit Numbers

The video tutorial demonstrates how to subtract multiples of 10 from three-digit numbers mentally. It covers three examples: subtracting 30 from 355, 40 from 644, and 50 from 167. The process involves identifying the number of tens in each number and subtracting the corresponding tens, resulting in a simplified mental calculation.

What is the main concept introduced in this video?

• Subtracting multiples of 10 from three-digit numbers

• Multiplying three-digit numbers by 10

• Adding multiples of 10 to three-digit numbers

• Dividing three-digit numbers by 10

In the example of subtracting 30 from 355, how many tens are subtracted?

• One

• Four

• Two

• Three

What is the result of subtracting 30 from 355?

• 325

• 335

• 345

• 315

How many tens are initially present in the number 355?

• Five

• Three

• Six

• Four

What is the difference between the tens in 355 and the tens in 325?

• Three

• One

• Two

• Four

In the example of subtracting 40 from 644, how many tens are subtracted?

• Five

• Four

• Three

• Two

What is the result of subtracting 40 from 644?

• 634

• 624

• 614

• 604

How many tens are initially present in the number 644?

• Seven

• Six

• Four

• Five

What happens to the tens place when subtracting 40 from 644?

• It decreases by four

• It increases by four

• It remains the same

• It doubles

What is the difference between the tens in 644 and the tens in 604?

• One

• Two

• Three

• Four