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
Numbers sit in order
On the line, 12 comes before 13. 13 comes before 14.
Right is more
Hop one step to the right. The number is one more.
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.
What is one more than 15?
Start on 15. Hop one step to the right. You land on 16.
Answer: 16What 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.
What comes after 11?
Show answer
12
What comes after 19?
Show answer
20
What is one less than 14?
Show answer
13
Start at 10. Hop 5 to the right.
Show answer
15
Fill the gap: 16, 17, __, 19
Show answer
18