After 10 comes 11 — all the way to 20. These are the "teen" numbers!
Once we reach 10, we keep going! The numbers 11 through 20 are called the "teen" numbers. Each of them has a ten hiding inside, plus a few extras.
10 + 1 = 11 · 10 + 2 = 12 · 10 + 3 = 13 · 10 + 4 = 14 · 10 + 5 = 15
Count all the dots:
10 blue dots + 3 yellow dots = 13 dots in all!
The teen numbers:
What number comes after 15?
Remember This!
The word "teen" means "ten and some more." Thirteen = ten + three. Fourteen = ten + four. See the pattern?