Number & Operations in Base Ten
Counting Sequence to 120
Counting forward from any given number up to 120.
Counting Past 100
You already know how to count a group of objects one at a time. This lesson stretches that same counting skill further — past 20, past 100, all the way to 120 — and starting from any number, not just from 1.
The counting sequence follows a pattern. After each group of ten (29, 39, 49...), the next number starts a new decade (30, 40, 50...). Once past 99, the pattern continues the same way: 100, 101, 102, and on through 120.
Worked Example — Counting On from a Given Number
Worked Example — Counting Through 100
Tip
Common Mistakes
Skipping directly from a number like 29 to 40, missing the 30s entirely.
After any number ending in 9, the next ten-number is the very next decade in order — 29 is followed by 30, not 40.
Losing the pattern around 100, such as counting 98, 99, 200 instead of 98, 99, 100.
100 comes right after 99, the same way any decade follows the number ending in 9. After 100, the pattern of the 100s continues: 101, 102, 103.
Key Takeaways
- The counting sequence can start at any number, not just at 1.
- A new decade begins right after each number ending in 9.
- The pattern continues the same way through 100 and up to 120.
Summary
Counting to 120 extends the same number sequence you already know into much bigger numbers. Next, that count of objects gets written down as a numeral, connecting the spoken count to the symbol for it.
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