Count Sequentially within 1000

Students will count forward and backward within 1000, correctly sequencing numbers and accurately crossing decade and century boundaries (e.g., 198, 199, 200, 201).

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Grade 2 · Counting and Skip-Counting to 1000 · question 1 of 3

0 of 12

12 rungs. A star at the top.

Counting back, what is C?

Your answer:

How it is taught

0:00 of 3:18

Counting follows a pattern of ones, tens, then hundreds.

After nine ones, the next ten ticks over.

Read it: Read a point on the line

Each tick is 1 more. A sits between 518 and 520. So A is 519.

Find the label next to the point.
Count the ticks from that label, 1 for each tick.
Count on to the right. Count back to the left.

The ticks are evenly spaced, so each one is 1 more than the last.

Counting from the nearest label keeps the count short.

After 199 comes 200: a new hundred starts.

Start at a label. Count 1 for each tick to reach the point.

Reading A as 520, the next label.

Count the ticks: 518, then 519. A is 519.

What comes right before 600? — 599. 1 less than 600 is 599.

198, 199, 200, 201, 202

When we count, sometimes we cross into a brand new hundred. Let's see how that works!

Here's a number line. We'll count up, starting near two hundred.

Start at one hundred ninety-eight.

Add one. The next number is one hundred ninety-nine.

Now, what comes after one hundred ninety-nine? This is the tricky one!

Two hundred! When we add one more, the ones, tens, and hundreds all roll over together.

Keep going. After two hundred comes two hundred one.

Then two hundred two. We crossed into a brand new hundred!

One ninety-eight, one ninety-nine, two hundred, two oh one, two oh two. Counting just keeps going!

Grade 2 · Crossing into a new hundred

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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