Lesson Notes By Weeks and Term v5 - Grade 3

Lesson Video

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Performance objectives

• Identify the place value of each digit in a 3-digit number.
• Decompose 3-digit numbers into hundreds, tens, and ones.
• Represent numbers using blocks and drawings.
• Compare and order 3-digit numbers.
• Skip count forwards and backwards in 1s, 10s and 100s.

Lesson summary

Welcome, Grade 3 learners! This week, we're diving into the exciting world of numbers between 0 and

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9. Understanding these numbers is super important because we use them every day! Think about buying sweets at the spaza shop, counting the number of children in your class, or even looking at house numbers in your street. All of these involve understanding numbers from 0 to

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9. Having a good grasp of place value – understanding what each digit in a number means – will make adding, subtracting, and even larger calculations much easier as you progress through school. It will also help you make smart choices when you're saving money or working with different quantities.

Lesson notes

Place Value: Hundreds, Tens, and Ones (Units) Every digit in a number has a specific value depending on its position, or place. In a 3-digit number, we have three places: Hundreds Place: This is the place furthest to the left. A digit in the hundreds place represents how many groups of one hundred we have. For example, in the number 345, the '3' represents 3 hundreds, or

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0. Tens Place: This is the middle place. A digit in the tens place represents how many groups of ten we have. In the number 345, the '4' represents 4 tens, or

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0. Ones (Units)

Place: This is the place furthest to the right. A digit in the ones place represents how many single units we have. In the number 345, the '5' represents 5 ones, or

5. Understanding Decomposition Decomposition means breaking down a number into its different place values and writing it as a sum. For example, the number 428 can be decomposed as: 428 = 400 + 20 + 8 This is because 428 has 4 hundreds (400), 2 tens (20), and 8 ones (8). Using Concrete Materials To help visualize place value, we can use concrete materials like base-ten blocks.

These blocks usually come in three sizes: Hundreds Block: A large square representing

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0. Tens Rod: A long rod representing

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0. Units Cube: A small cube representing

1. So, to represent the number 231, you would use 2 hundreds blocks, 3 tens rods, and 1 unit cube. Comparing and Ordering Numbers To compare numbers, we start by looking at the hundreds place. The number with the larger digit in the hundreds place is the larger number. For example, 567 is greater than 321 because 5 (hundreds) is greater than 3 (hundreds). If the hundreds digits are the same, we move to the tens place. The number with the larger digit in the tens place is the larger number. For example, 456 is greater than 432 because 5 (tens) is greater than 3 (tens). If both the hundreds and tens digits are the same, we move to the ones place. The number with the larger digit in the ones place is the larger number. For example, 238 is greater than 235 because 8 (ones) is greater than 5 (ones). We use the symbols ">" (greater than), " 321 (567 is greater than 321) 321 5 29?

Solution: The underlined digit is '5'. It is in the hundreds place.

Therefore, its value is

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0. Commentary: This question directly tests LO1, focusing on identifying place value.

Question 2: Represent the number 346 using decomposition.

Solution: 346 = 300 + 40 + 6

Commentary: This question assesses LO

2. We are breaking down the number into its component parts.

Question 3: Use ">" or " " or "<" to compare the numbers 347 and

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4. Skip count backwards in 100s starting at

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0. Write the next three numbers. Represent the number 412 using decomposition. What number is represented by 2 hundreds, 6 tens, and 8 ones? Order these numbers from smallest to largest: 521, 215,

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2. Represent the number 243 using drawings of hundreds squares, tens rods, and unit cubes. What is the value of the digit 8 in the number 842?