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
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One ten at a time
One rod is 10. Two rods are 20. Three rods are 30.
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Say the tens
10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
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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.
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Count by 10s: 10, 20, 30, __
Add one ten to 30. That is 40.
Answer: 40 -
Count 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.
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Count by 10s: 10, 20, __
Show answer
30
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Count by 10s: 40, 50, __
Show answer
60
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Count by 10s: 60, 70, __
Show answer
80
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What comes after 90 when you count by 10s?
Show answer
100
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How many rods make 50?
Show answer
5