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🇨🇩 Numeration

Sorting, classifying and counting to 20

⏱ 15 minOfficial programme: CD-P1-NUM-01

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🎯 In this lesson, you will learn to

  • Sort/classify by one or two attributes.
  • Count, read, write and place 0-20 on a number line.

The lesson

Introduction

At the market, Mujinga sorts her mangoes. She puts the big ones together. Then she counts them: 1, 2, 3! Sorting and counting are useful every day.

Explanation

Sorting means putting similar things together.

We can sort by colour, by shape or by size.

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  • The red circles: 3.
  • The blue circles: 2.

Explanation

To count, touch each object once. Say one number each time. The last number you say is the total.

Here are the numbers, in small groups:

  • 0, 1, 2, 3, 4, 5.
  • 6, 7, 8, 9, 10.
  • 11, 12, 13, 14, 15.
  • 16, 17, 18, 19, 20.

0 means: there is nothing.

Explanation

On the number line, each mark is a number.

Numbers go from left to right. The further right, the bigger the number.

After 12 comes 13. Before 12 comes 11.

Write digits carefully: 15 is written with a 1 and a 5.

Worked example

Problem: How many bananas?

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Step 1: Touch the 1st banana. Say 1.

Step 2: Touch the next one. Say 2. Keep going to the end.

Step 3: The last number said is 7.

Answer: there are 7 bananas.

Worked example

Problem: Ilunga sorts his animals.

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How many hens?

Step 1: Look for the hens 🐔.

Step 2: Count them: 1, 2, 3.

Answer: there are 3 hens. There are also 2 goats.

Watch out

Watch out: do not count the same object twice. Do not skip an object either. Touch each object once. You can cross it out with your finger or pencil.

Key points

  • Sorting means putting similar things together.
  • We sort by colour, shape or size.
  • We count one object at a time.
  • Numbers go from 0 to 20.
  • On the line, the next number is to the right.

✍️ Exercises

Answer one exercise at a time. Your answer is checked right away, with an explanation.

Exercise 1 of 9

★ Easy

How many mangoes? 🥭🥭🥭🥭🥭🥭

Your answer