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Understand Teen Numbers as a Ten and Some Ones

Students will represent and explain numbers 11–19 as one group of ten plus additional ones. Students use models such as ten-frames or base-ten blocks to show that, for example, 14 = 1 ten + 4 ones.

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Understand Teen Numbers as a Ten and Some Ones

Grade 1 · Counting and Place Value to 120 · question 1 of 3

0 of 12

12 rungs. A star at the top.

12 = 10 + .

How it is taught

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Teen numbers are one ten and leftovers.

The 1 stands for a full ten.

Read it: 10 ones make a ten

You have 27 cubes. Counting them one by one is slow. 2 tens sit bundled, and 7 ones sit loose.

  1. Bundle every 10 ones into a ten.
  2. Count the bundles as tens: 2 tens.
  3. Count the leftover ones: 7. Read 2 tens and 7 ones as 27.

Counting all 27 cubes from one works, but it is slow, and it gets slower as the heap grows.

Bundles stay together, so you count 2 tens instead of 20 loose cubes.

The left digit of 27 counts bundles of 10; the right digit counts cubes still loose.

The tens digit counts those bundles; leftover cubes are the ones.

Counting the 2 ten-cubes as 2 ones, then saying 2 and 7 make 9.

Each of those 2 cubes is already 10. 2 tens is 20, plus 7 ones is 27.

How many tens are in 12? — 1. Bundle 10 ones at a time: 12 is 1 ten and 2 ones left loose.

14 = 1 ten + 4 ones

Today we'll learn a cool trick about teen numbers. Let's look at fourteen!

Here is the number fourteen. We write it with a one and a four.

But what does fourteen really mean? Let's show it with dots.

First, fill a ten-frame: two rows of five dots, ten in all.

All ten dots together make one group of ten — we call it one ten.

But fourteen has more than ten. Four extra dots go on the side.

These four leftover dots are our ones — four ones.

Put them together: ten plus four equals fourteen!

So fourteen is one ten and four ones. That's the teen-number trick!

What is the number 14?Let's break it apart with dots!14fourteenWhat does 14 mean?●●●●●●●●●●1 ten= 10 ones+●●●●4 ones10 + 4 = 1414 =1 ten +4 onesteen number!
Grade 1 · Building 14 with a ten-frame

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics
Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal
1 star — one skill mastered, every rung of its ladder climbed
Climbing now
Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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