Curriculum placement
Kindergarten. This describes the skill, not a learner estimate.
Teen numbers as a ten and ones
Compose teen numbers from a ten and extra ones
Problem types
- One ten and extra ones
Builds on
- Making 10
- Numerals through 20 · Earlier idea
A teen numeral writes one ten as the digit 1 and the extra ones as the second digit, so 14 is written as 1 ten and 4 ones.
Leads to
- Reading and writing tens and ones
- Ten more and ten less · Extend the idea
A teen is ten plus ones, so ten more than 14 changes the tens and leaves the ones, which is the same idea as for larger numbers.
- Adding within 20 · See it applied
Adding 8 + 5 by filling a ten leaves 3 more ones, which is the teen number 13 made of one ten and three ones.
Related skills
- Counting on and counting back · Related idea
Teen numbers count on from ten, the same way a count-on strategy begins at a number and moves forward one at a time.
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