Understanding the Number 225

The video tutorial revises numbers from 1 to 999 using colorful candles. It explains the decimal system based on ones, tens, and hundreds. The relationship between these units is discussed, emphasizing that 10 ones make a ten and 10 tens make a hundred. Nancy's purchase of 225 candles serves as a practical example to demonstrate different ways to represent numbers, including using blocks, place value, expanded form, standard form, and words.

What is the base of the decimal system?

• Base 16

• Base 10

• Base 8

• Base 2

How many ones make up a ten?

• 5

• 20

• 15

• 10

How many tens are needed to make a hundred?

• 5

• 20

• 15

• 10

How many candles did Nancy buy?

• 325

• 125

• 425

• 225

How can the number 225 be represented using blocks?

• 5 hundreds, 2 tens, 2 ones

• 2 hundreds, 2 tens, 5 ones

• 2 hundreds, 5 tens, 2 ones

• 2 hundreds, 5 tens, 5 ones

What is the place value of the digit '2' in the hundreds place of 225?

• 200

• 20

• 2

• 2000

What is the value of the digit '5' in the number 225?

• 5

• 5000

• 500

• 50

How is the number 225 represented in a place value chart?

• 5 in hundreds, 2 in tens, 2 in ones

• 2 in hundreds, 5 in tens, 2 in ones

• 2 in hundreds, 2 in tens, 5 in ones

• 5 in hundreds, 5 in tens, 2 in ones

What is the expanded form of 225?

• 200 + 20 + 5

• 200 + 25

• 20 + 200 + 5

• 2 + 20 + 5

How do you write 225 in words?

• Two hundred twenty-five

• Two hundred fifty

• Two hundred fifty-two

• Two hundred five