Lesson 4 of 8 · Kindergarten
Count to 20 on a number line
A number line shows numbers in order. Each hop to the right is one more.
Step 1
Learn it
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Numbers sit in order
On the line, 12 comes before 13. 13 comes before 14.
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Right is more
Hop one step to the right. The number is one more.
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Left is less
Hop one step to the left. The number is one less.
Step 2
Watch how
Two examples, worked out one step at a time.
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What is one more than 15?
Start on 15. Hop one step to the right. You land on 16.
Answer: 16 -
What is one less than 19?
Start on 19. Hop one step to the left. You land on 18.
Answer: 18
Step 3
Play with it
Pick a start and a hop size. Watch Hop the frog jump.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
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What comes after 11?
Show answer
12
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What comes after 19?
Show answer
20
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What is one less than 14?
Show answer
13
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Start at 10. Hop 5 to the right.
Show answer
15
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Fill the gap: 16, 17, __, 19
Show answer
18