D.4 Count by 2s, 5s, and 10s on a number chart from 0 to 120
What does it mean to count by 2s, 5s, and 10s?
Counting by 2s, 5s, and 10s means adding the same number again and again instead of counting by ones. This helps you count faster and see number patterns.
- Counting by 2s: 2, 4, 6, 8, 10
- Counting by 5s: 5, 10, 15, 20
- Counting by 10s: 10, 20, 30, 40
Counting by equal steps is called skip counting.
Using a number chart from 0 to 120
A number chart shows numbers in order from 0 to 120. You can use it to find patterns when you count by 2s, 5s, or 10s.
- When you count by 10s, the numbers line up in a straight column.
- When you count by 5s, every number ends in 0 or 5.
- When you count by 2s, the numbers are all even numbers.
Looking at a number chart helps you see patterns more clearly.
Counting by 2s
When you count by 2s, you add 2 each time. This is another way to count even numbers.
- Start at 0: 0, 2, 4, 6, 8
- Start at 3: 3, 5, 7, 9, 11
You can start counting by 2s from any number on the chart.
Counting by 5s
When you count by 5s, you add 5 each time. This helps when counting groups of five.
- Start at 0: 0, 5, 10, 15, 20
- Start at 7: 7, 12, 17, 22, 27
Numbers counted by 5s often end in 0 or 5.
Counting by 10s
When you count by 10s, you add 10 each time. This is a fast way to count larger amounts.
- Start at 0: 0, 10, 20, 30, 40
- Start at 25: 25, 35, 45, 55, 65
When counting by 10s, the ones digit stays the same.
Starting from any number
You do not have to start at 0. You can start from any number and count by 2s, 5s, or 10s.
- Count by 2s starting at 8: 8, 10, 12, 14
- Count by 5s starting at 30: 30, 35, 40, 45
- Count by 10s starting at 90: 90, 100, 110, 120
Always add the same number each time to stay on track.
Common Core alignment: CCSS.MATH.CONTENT.1.NBT.A.1 – Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
Notes for teachers
This free lesson is aligned with CCSS.MATH.CONTENT.1.NBT.A.1. Use it for whole-class instruction, small groups, independent practice, or homework.
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