Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

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Performance objectives

• Identify place value (Hundreds, Tens, Units) and the value of digits in a 3-digit number.
• Write 3-digit numbers in expanded notation.
• Compare and order whole numbers up to 1 000.
• Round off numbers to the nearest 10.

Lesson summary

Introduction Welcome, Grade 4 mathematicians! This week, we start an exciting journey with whole numbers. Numbers are everywhere in our lives here in South Africa. Think about the price of a cool drink at the spaza shop (maybe R12), the number of learners in our school (perhaps 450), or the distance from Polokwane to Pretoria (about 300 km). To understand and work with these numbers, we first need to understand a secret code called 'place value'. Place value helps us see that the '4' in 450 is much bigger than the '4' in the number

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4. This week, we will focus on numbers all the way up to 1 000, learning how to build them, break them apart, compare them, and round them.

Lesson notes

What is Place Value? In a number, every digit has a special position or 'place'. This place tells us the value of the digit. It's like having a house address; the street name tells you where to find the house. In Grade 4, we focus on three main places for numbers up to 999: Hundreds (H): How many groups of

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0. Tens (T): How many groups of

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0. Units (U): How many single ones. Let's look at the number 684. | Hundreds (H) | Tens (T) | Units (U) | |--------------|----------|-----------| | 6 | 8 | 4 | The digit 4 is in the Units place. Its value is 4 x 1 =

4. The digit 8 is in the Tens place. Its value is 8 x 10 =

8

0. The digit 6 is in the Hundreds place. Its value is 6 x 100 =

6

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0. So, even though '6' is smaller than '8', its value in this number is much bigger because of its place! Expanded Notation Expanded notation is a way of breaking a number down to see the value of each digit clearly. We write the number as an addition sum of its values.