A.3 Count on a number chart from 0 to 120
What is a number chart?
A number chart shows numbers written in order. In first grade, students use a number chart to see and understand numbers from 0 to 120.
- The chart starts with 1.
- The numbers increase by 1 each time.
- After 19 comes 20, and after 99 comes 100.
Number charts help students see number patterns and understand how numbers grow.
Counting on using a number chart
Counting on means starting from a number and saying the next numbers in order, instead of starting at zero.
- Start at 34: 35, 36, 37
- Start at 58: 59, 60, 61
Counting on helps students count faster and build number confidence.
Counting forward by ones
When counting forward by ones, each number is one more than the number before it.
- 12, 13, 14, 15
- 89, 90, 91, 92
Look at the number chart to help you remember what number comes next.
Understanding rows and columns
A number chart is arranged in rows and columns. Numbers move across a row and then continue on the next row.
- Numbers increase by 1 across a row.
- Numbers increase by 10 when moving down a column.
Columns help students see groups of ten.
Counting across tens
When counting, some numbers end in 9 and the next number begins a new group of ten.
- 29, 30, 31
- 59, 60, 61
- 99, 100, 101
Pay close attention when counting after numbers that end in 9.
Why counting to 120 is important
Counting to 120 helps students understand place value, number order, and patterns in numbers.
- Knowing that 47 comes before 48.
- Seeing that 110 is ten more than 100.
Strong counting skills help students succeed in addition, subtraction, and place value.
Common Core alignment: CCSS.MATH.CONTENT.1.NBT.A.1 – Count to 120, starting at any number less than 120.
Notes for teachers
This free lesson is aligned with CCSS.MATH.CONTENT.1.NBT.A.1. Use it for whole-class instruction, independent practice, or homework.
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