Virginia SOL Math / Grade 1 / Number & Number Sense

1.NS.1

Count to 120

What you'll learn

  • Count forward by ones, twos, fives, and tens to 120
  • Count on from any number up to 120
  • Group objects into tens and ones to count them

Words to know

Count —
to say numbers in order
Skip count —
to count by twos, fives, or tens
Ten —
a group of 10 ones
One —
a single object or unit
Group —
a set of objects put together

Why it matters Counting helps you know how many you have, share fairly, and skip counting makes counting big piles much faster.

Worked examples

Model ItI do

Count on from 47 to 52.

Start at 47 and say the next numbers: 48, 49, 50, 51, 52. You do not have to start over at 1. You can count on from any number.

Try It TogetherWe do

Skip count by tens: 10, 20, 30, ___, ___.

Each time we add one more ten. After 30 comes 40, and after 40 comes 50. The numbers are 40 and 50.

Now YouYou do

Skip count by fives: 5, 10, 15, ___, ___.

Add five each time to find the next two numbers. Check your answer in the back of this chapter.

Practice

Mastered 0 of 11

Warm-up

Ease in with the basics.

  1. 1.Count on: 5, 6, 7, ___.

  2. 2.Skip count by tens: 10, 20, ___.

  3. 3.What number comes right after 10?

On Level

The core Quick Check from the book.

  1. 1.Count on: 68, 69, 70, ___.

  2. 2.Skip count by tens: 40, 50, 60, ___.

  3. 3.Skip count by twos: 2, 4, 6, ___.

  4. 4.What number comes right after 99?

  5. 5.Skip count by fives: 15, 20, 25, ___.

Challenge

Stretch your thinking.

  1. 1.Skip count by fives from 85: 85, 90, 95, ___, ___.

  2. 2.Count on by twos: 114, 116, 118, ___.

  3. 3.Show 62 as tens and ones, then say how many ones are left over after the tens.