Understand a Hundred as a Bundle of Ten Tens

Students will understand that 100 is composed of 10 groups of ten, building on their knowledge of tens and ones. They will use physical models (like base-ten blocks) to show that 10 tens equal 1 hundred.

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Real questions from this skill, graded here. No account, and nothing is saved.

Grade 2 · Understanding Place Value to 1000 · question 1 of 3

0 of 12

12 rungs. A star at the top.

7 hundreds = tens

How it is taught

0:00 of 2:17

One hundred is ten groups of ten.

Two hundreds are twenty tens.

Read it: Hundreds, tens and ones

640 in a chart: 6 chips of 100, 4 chips of 10 and 0 chips of 1. So 640 is 6 hundreds, 4 tens and 0 ones.

Put each place in its own column: hundreds, tens, ones.
Count the chips in each column: 6, 4 and 0.
Write the digits in that order: 640.

A chip of 100 is worth 10 chips of 10, and a chip of 10 is worth 10 chips of 1.

Each digit tells how many chips are in its place.

A 0 holds an empty place: 640 has no ones, and 305 has no tens.

Each digit tells how many hundreds, tens or ones. 10 of a place make 1 of the next.

Reading 640 as 64, because the ones place is empty.

The 0 holds the ones place: 6 hundreds, 4 tens and 0 ones is 640.

30 tens = ___ — 300. 10 tens make 1 hundred, so 30 tens make 3 hundreds: 300.

10 tens = 1 hundred

How big is one hundred? Let's build it together — one ten at a time.

Here is one ten. Ten ones bundled into a single ten-stick.

Add another ten. Ten and ten makes twenty.

Three tens. Skip-count with me — ten, twenty, thirty.

Four tens is forty. Five tens is fifty. We're halfway!

Six tens, sixty. Seven tens, seventy.

Eight tens, eighty. Nine tens, ninety. So close!

One more ten. That makes ten tens — and ten tens is one hundred.

Grade 2 · Building 100 from ten groups of ten

Bundle all ten tens together. This whole group is one hundred.

Ten tens equal one hundred. That's how big a hundred really is!

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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Standards

CCSS.2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones

CCSS.2.NBT.A.1a

100 can be thought of as a bundle of ten tens — called a 'hundred'

Grade 2

Quoted from the Common Core State Standards.

Where this sits

Comes after

Understand the Tens and Ones in Two-Digit Numbers

Leads to

Understand Three-Digit Numbers as Hundreds, Tens, and Ones

What a star here means

A star here is the top of a twelve-rung ladder, in four blocks of equal length — three of facts and one of the skill used in a real question — where a right answer climbs one rung and a wrong one drops back to the start of the block, never below it. The star is kept for good. How we grade

All of Grade 2

This is one rung of 85 in Grade 2 mathematics, in the order they build on each other.

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