Lesson 2 of 8 · Grade 1 and 2
Teen numbers
A teen number is one ten and some ones. 14 is 1 ten and 4 ones.
Step 1
Learn it
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Start with a ten
Every teen number has one ten. Put down one rod.
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Add the ones
Add 4 cubes. Now you have 1 ten and 4 ones.
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Say it
That is 14. The 1 is the ten. The 4 is the ones.
Step 2
Watch how
Two examples, worked out one step at a time.
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How many are shown?
1 ten is 10. Plus 6 ones is 16.
Answer: 16 -
10 + 9 = ?
1 ten and 9 ones is 19.
Answer: 19
Step 3
Play with it
Add ones. Snap ten ones into one ten.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
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How many are shown?
Show answer
12
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How many are shown?
Show answer
17
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1 ten and 8 ones is what number?
Show answer
18
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15 is 1 ten and how many ones?
Show answer
5
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13 is 10 and ?
Show answer
3