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Reach Crest Learning

Count and compare · Lesson 9 of 32

Count across the tens

Read with an adult. Take your time. You can say, point, draw or write your answer.

Let's look together

After 19 comes 20. After 29 comes 30. The counting pattern keeps going.

We can start anywhere. To count backwards, say the numbers in the other order. Look at the tens change as we cross a ten.

252627282930313233343529, 30, 31
Look, point and talk with your adult.

Watch how I do it

I start at 28: 28, 29, 30, 31, 32. Backwards from 32: 32, 31, 30, 29, 28.

Your turn

Fill the gaps: 97, 98, __, 100. Now count backwards: 42, 41, __, __.

Have a go before opening the answer.

Let's check together

99; then 40, 39.

Try it away from the page

An adult chooses a starting number up to 95. Count five steps on. Then count back. Read and write the numerals you say.

Open your writing and drawing pad

Write, draw or show your working. Use a mouse, pen or finger. This pad is not a submitted answer.

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Open a picture saved on this device to draw on it again. Opening replaces the drawing, but Undo can restore it. PNG only, up to 4 MB and 4096 × 4096 pixels. The picture stays in this browser; it is not uploaded. Paper lines in a saved picture become part of that picture.

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Open a UTF-8 TXT file from this device, up to 40 KB and 10,000 characters. It stays in this browser. Opening can be undone until you type again. Downloads keep a new copy; they do not change the file you opened.

Typed notes are not submitted answers.

Explore and practise freely. Opening this lesson or using the writing pad does not save completion or a score.

Adult notes · prerequisites, safety and coverage

Prerequisite: secure 0–20. Use bundles of ten and a hundred chart. Practise each decade, including 99 to 100; one example is not mastery.

Use large counters, blocks and paper before symbols. Revisit a lesson until the child can show and explain the idea. Numbers grow from 0–10 to 20, then 100; these pages are not a one-sitting course.

These are teaching introductions, not a claim of mastery. Open the subject's coverage map and limits.