Kindergarten · Math · week 19

Ten and some more: building 11, 12, 13

Understand teen numbers 11 through 13 as one group of ten plus some more ones, building them with objects.

Every teen number is a secret: it is always ten, plus a little more. Eleven is ten and one more. Twelve is ten and two more. Thirteen is ten and three more.

Count out ten objects first, every time. Then add a few more ones on the side.

📋 For the teacher
Teach it (10–15 min):
  • Always count out a full ten first, then add the extra ones on the side. Keep them visually separate.
  • Use a ten-frame, a 2 by 5 grid, if you have one, or just a clear group of ten.
  • Say it the same way every time: ten and how many more is what number.
  • This idea is the foundation for all place value later. Go slowly and keep it concrete.
Talk about it:
  • What is the same about 11, 12, and 13?
  • How many tens are in any teen number?
  • Can you build 12 with blocks and show me the ten and the two more?

Mastery looks like: They build 11, 12, and 13 with objects, correctly showing one group of ten plus the extra ones.

Common stumbles: Not grouping a clear ten first; counting a jumbled pile instead of keeping the ten and extras visually separate.

See it visually

Interactive, spoken-aloud tools that show this idea in motion.

AdditionSee groups combine — with counters, blocks, and the number line.try →
Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Math for this learner.
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