Topic 1 of 8
Counting to 100 by ones and tens
Step 2 · Numbers to 100 topics
Count all the way to 100, by ones and by tens, and start counting from any number.
Counting by ones
Counting by ones means saying every number: 21, 22, 23, 24. After 20, the numbers follow a pattern. Twenty-one, twenty-two, twenty-three… is like one, two, three with "twenty" in front.
When you reach a number ending in 9, the next number starts a new ten. After 29 comes 30. After 59 comes 60. After 99 comes 100.
| After | comes |
|---|---|
| 29 | 30 |
| 39 | 40 |
| 49 | 50 |
| 69 | 70 |
| 99 | 100 |
Counting by tens
Counting by tens means saying every tenth number: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. Each jump is ten more.
Ten tens make 100. Counting by tens is a quick way to count lots of things that come in tens, like fingers on ten hands.
Starting from any number
You do not have to start at 1. To count on from 47, say 47 and keep going: 48, 49, 50, 51.
Example: Counting on
Count on 5 from 38.
- Start at thirty-eight.
- Say five more numbers: thirty-nine, forty, forty-one, forty-two, forty-three.
Answer43
Try it yourself
Work each one on paper first, then open the answer to check.
What comes after 49?
Show answer
50.
Count by tens from 10 to 100.
Show answer
10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
What comes after 79?
Show answer
80.
Count on 4 from 56.
Show answer
57, 58, 59, 60. You stop at 60.
How many tens make 100?
Show answer
10 tens.