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Understand Multiples of Ten as Groups of Tens

Students will understand that the decade numbers 10, 20, 30, 40, 50, 60, 70, 80, and 90 represent one through nine groups of ten with zero ones. Students use models and place value language to describe these numbers.

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Understand Multiples of Ten as Groups of Tens

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

0 of 12

12 rungs. A star at the top.

Lia has 6 bundles of 10 sticks. How many sticks total?

How it is taught

0:00 of 1:40

Tens with zero ones make a decade number.

The ones place is 0.

Read it: Groups of ten: count by tens

5 tens is 5 groups of ten. Count by tens from 0: 10, 20, 30, 40, 50. So 5 tens = 50.

  1. Say how many tens: 5.
  2. Jump 10 from 0 that many times: 10, 20, 30, 40, 50.
  3. Say where you land: 5 tens = 50.

Each jump of 10 is 1 group of ten.

Counting by tens is quicker than counting 50 ones.

The number of tens is the first digit: 5 tens is 50.

Count by tens from 0, once for each ten.

Writing 5 for 5 tens.

5 tens is 5 groups of ten: count 10, 20, 30, 40, 50.

8 groups of 10 = ___ — 80. Count by tens: 10, 20, 30, 40, 50, 60, 70, 80. 8 tens = 80.

40 = 4 groups of 10

Forty straws come in bundles of ten. Let's count the bundles together!

Here's one bundle. That's ten straws.

Add another bundle. Ten and ten makes twenty.

One more bundle. Ten, twenty, thirty.

And one last bundle. Ten, twenty, thirty, forty!

Look — we have four groups of ten.

We write a four in the tens place to show four tens.

And a zero in the ones place, because there are no extra ones.

Four tens and zero ones makes the number forty.

4 bundles of 10 straws1010, 2010, 20, 3010, 20, 30, 40101010104 groups of tentensones404 tens + 0 ones = 40ANSWER40four tens
Grade 1 · Counting bundles of ten

So forty is just four groups of ten. Great counting!

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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