Introduction
At the market, Mujinga has 8 mangoes. She wants to share them with her sister. Each one must get the same number. 🥭 In this lesson, you learn to share in equal parts. You also learn to double.
🇨🇩 Numeration
Half, double, third, quarter
⏱ 15 minOfficial programme: CD-P1-NUM-02
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🎯 In this lesson, you will learn to
- Find half, double, third and quarter of a concrete collection.
The lesson
Explanation
Half: we share into 2 equal parts.
Half of 8 mangoes:
🥭🥭🥭🥭 | 🥭🥭🥭🥭
Each part has 4 mangoes. Half of 8 is 4.
Double: we take the number 2 times.
The double of 4 is .
Explanation
A third: we share into 3 equal parts. We take 1 part.
Third of 6 bananas:
🍌🍌 | 🍌🍌 | 🍌🍌
A third of 6 is 2.
A quarter: we share into 4 equal parts. We take 1 part.
Quarter of 8 stones:
🪨🪨 | 🪨🪨 | 🪨🪨 | 🪨🪨
A quarter of 8 is 2.
Worked example
Problem: Kalala has 10 bottle caps. He gives half to Esengo. How many does he give?
Step 1: I share 10 into 2 equal parts.
🔸🔸🔸🔸🔸 | 🔸🔸🔸🔸🔸
Step 2: Each part has 5 caps.
Answer: Kalala gives 5 caps.
Worked example
Problem: Neema has 12 pencils. What is a third? What is a quarter?
Step 1: Third: 3 equal parts. 4 + 4 + 4 = 12. One part is 4.
Step 2: Quarter: 4 equal parts. 3 + 3 + 3 + 3 = 12. One part is 3.
Answer: A third of 12 is 4. A quarter of 12 is 3.
Watch out
Watch out: the parts must be equal. If one part is bigger, it is not half. Do not mix up half and double. Half of 6 is 3. The double of 6 is 12.
Key points
- Half: 2 equal parts.
- Double: 2 times the number.
- Third: 3 equal parts.
- Quarter: 4 equal parts.
- The parts are always equal.
✍️ Exercises
Answer one exercise at a time. Your answer is checked right away, with an explanation.
Exercise 1 of 8
★ EasyWhat is half of 6?