Lesson 6 of 8 · Kindergarten
Count by 10s to 100
Count by 10s: 10, 20, 30. Each jump is one whole ten.
Count by 10s to 100: the list
10, 20, 30, 40, 50, 60, 70, 80, 90, 100
There are 10 tens in 100.
Add tens
- 20 + 60 = 80
- 30 + 40 = 70
Step 1
Learn it
One ten at a time
One rod is 10. Two rods are 20. Three rods are 30.
Say the tens
10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
See the pattern
Every number ends in 0. The first digit goes up by one each time.
Step 2
Watch how
Two examples, worked out one step at a time.
Count by 10s: 10, 20, 30, __
Add one ten to 30. That is 40.
Answer: 40Count by 10s: 70, 80, __
Add one ten to 80. That is 90.
Answer: 90
Step 3
Play with it
Count by 2, 5 or 10 and light up the 100 chart.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
Count by 10s: 10, 20, __
Show answer
30
Count by 10s: 40, 50, __
Show answer
60
Count by 10s: 60, 70, __
Show answer
80
What comes after 90 when you count by 10s?
Show answer
100
How many rods make 50?
Show answer
5