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Grade 2 · Maths · Lessons
Counting in steps: ones, tens, hundreds
1️⃣ones🔟tens💯hundreds🪜steps
Count in steps.
The big ideaEvery jump is the same size. Watch the digit that changes.

How it works

Every jump is the same size: 1, 10 or 100.

Watch the digit that changes: it is the place you're jumping in.

Counting on by 10 changes the tens digit. By 100, the hundreds.

8009001000+100start
Counting on by 100 from 807.

Example 1: Add a hundred

  1. 807 + 100 = ?
  2. Add one to the hundreds digit.
  3. The tens and ones stay the same.
  4. So the answer is 907.

Example 2: Count in ones

  1. 797, counting on in ones: ?, ?, ?, ?
  2. Say each number in order.
  3. After 799 comes 800.
  4. So the answer is 798, 799, 800, 801.

Example 3: Add a ten

  1. 597 + 10 = ?
  2. Add one to the tens digit.
  3. If the tens reach ten, the hundreds go up.
  4. So the answer is 607.

Words to know

count on
Say the next numbers in order.
step
The size of each jump.

Watch out

Try it

  1. 679, counting on in tens: ?, ?, ?, ?
  2. 249, counting on in tens: ?, ?, ?, ?
  3. ? = 481 − 10
Answers: 1. 689, 699, 709, 719 · 2. 259, 269, 279, 289 · 3. 471
For grown-upsCount in tens up the stairs, or in hundreds when you pass each lamp post.
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