Virginia SOL Math / Grade 2 / Number & Number Sense

2.NS.1

Place Value to 999

What you'll learn

  • Read, write, and identify the place and value of each digit in a three-digit number
  • Write numbers in standard, expanded, and word form
  • Compose and decompose numbers using hundreds, tens, and ones

Words to know

Digit —
any of the symbols 0 to 9 used to write numbers
Ones —
the place at the far right, worth 1 each
Tens —
the place worth 10 each
Hundreds —
the place worth 100 each
Standard form —
a number written with digits, like 253
Expanded form —
a number shown as the sum of each place value

Why it matters Place value lets us read and write numbers correctly, so we know the 5 in 253 means fifty, not just five.

Worked examples

Model ItI do

Name the place and value of each digit in 253.

The 2 is in the hundreds place, so its value is 200. The 5 is in the tens place, worth 50. The 3 is in the ones place, worth 3. In expanded form: 200 + 50 + 3.

Try It TogetherWe do

Write 406 in word form and expanded form.

Word form: four hundred six. The tens place is 0, so we do not name any tens. Expanded form: 400 + 6.

Now YouYou do

In the number 728, what is the value of the 7?

Find the place of the 7, then name its value. Check your answer in the back of this chapter.

Practice

Mastered 0 of 11

Warm-up

Ease in with the basics.

  1. 1.How many ones are in the number 8?

  2. 2.Write the number that has 4 tens and 0 ones.

  3. 3.Which digit is in the tens place in 63?

On Level

The core Quick Check from the book.

  1. 1.Write 315 in word form.

  2. 2.Write the value of the 4 in 452.

  3. 3.Write 200 + 30 + 6 in standard form.

  4. 4.How many tens are in 90?

  5. 5.Write two hundred nine in standard form.

Challenge

Stretch your thinking.

  1. 1.Write 704 in expanded form.

  2. 2.A number has 6 hundreds, 0 tens, and 9 ones. Write it in standard form.

  3. 3.Write five hundred eighty in standard form.