Lesson Notes By Weeks and Term v5 - Grade 3
Numbers 0–999: place value and operations (Grade 3) – Week 3 focus
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Numbers 0–999: place value and operations (Grade 3) – Week 3 focus
Download the Lessonotes Mobile South Africa app for faster lesson access on Android and iPhone.
Subject: Mathematics
Class: Grade 3
Term: 1st Term
Week: 3
Theme: General lesson support
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This week, we dive deeper into the world of three-digit numbers, exploring their structure and how we can add and subtract them. Understanding place value is like having a secret code for numbers; it helps us understand what each digit in a number really means. This is a crucial skill for everyday life in South Africa. When you go to the spaza shop to buy bread, milk, and sugar, you need to add up the prices. When you get pocket money, you need to know how much you have and how much you'll have left after buying something. This knowledge builds a strong foundation for all future mathematics, from working with money (Rands) to measuring distances between our beautiful cities and provinces.
A. What is Place Value? (Hundreds, Tens, Units) Every digit in a number has a special 'place' and a 'value'. The position of a digit tells us how much it is worth. In Grade 3, we focus on three places: Hundreds (H), Tens (T), and Units (U). Imagine the number
6
8
4. The digit 4 is in the Units place. Its value is just
4. The digit 8 is in the Tens place. Its value is not 8, but 8 tens, which is
8
0. The digit 6 is in the Hundreds place. Its value is not 6, but 6 hundreds, which is
6
0
0. We can show this in a place value chart: | Hundreds (H) | Tens (T) | Units (U) | |--------------|----------|-----------| | 6 | 8 | 4 | This is why we can break down, or decompose, the number: 684 = 600 + 80 + 4
B. Comparing Numbers ( , =) To compare two 3-digit numbers, we use a simple three-step check: Look at the Hundreds digit first. The number with the bigger Hundreds digit is the bigger number.
Example:* Compare 521 and
3
9
8. Since 5 (in the hundreds place) is bigger than 3, we know that 521 >
3
9
8. If the Hundreds are the same, look at the Tens digit. The number with the bigger Tens digit is the bigger number.
Example:* Compare 745 and
7
3
9. The Hundreds are both
7. We look at the Tens. Since 4 is bigger than 3, we know that 745 >
7
3
9. If the Hundreds and Tens are the same, look at the Units digit. The number with the bigger Units digit is the bigger number.
Example:* Compare 982 and
9
8
6. The Hundreds are both 9, and the Tens are both
8. We look at the Units. Since 6 is bigger than 2, we know that 982 , or = to compare the two numbers: 561 and 516*.
Solution: First, we compare the hundreds digits. Both numbers have a '5' in the hundreds place, so they are equal. Next, we compare the tens digits. The first number has a '6' (value 60) and the second number has a '1' (value 10). Since 6 is greater than 1, the first number is greater than the second.
The correct answer is: 561 >
5
1
6. Question 3: Calculate 315 + 463 using the breaking-down method.
Solution: Step 1 (Break down): 315 = 300 + 10 + 5 463 = 400 + 60 + 3 Step 2 (Group): Hundreds: 300 + 400 Tens: 10 + 60 Units: 5 + 3 Step 3 (Add groups): Hundreds: 300 + 400 = 700 Tens: 10 + 60 = 70 Units: 5 + 3 = 8 Step 4 (Combine): 700 + 70 + 8 = 778 Independent Practice (Questions Only) Write the number five hundred and forty-two in digits. What is the value of the underlined digit in 891? Break down the number 735 into hundreds, tens, and units. Fill in the missing symbol ( , or =): 409 ___
4
9
0. Fill in the missing symbol ( , or =): 250 + 10 ___
2
6
0. Calculate: 521 + 267 = ? (Use the breaking-down method).
Calculate: 869 - 345 = ? (Use the breaking-down method). Arrange these numbers from smallest to largest: 671, 176,
6
1
7. Naledi is reading a book with 385 pages. She has already read 152 pages. How many pages does she still have to read? At the Kruger National Park, a guide saw 112 elephants and 243 buffalo. How many animals did the guide see altogether?