Lesson Notes By Weeks and Term v5 - Grade 1
Numbers 0–20: counting, ordering and representing – Week 4 focus
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Numbers 0–20: counting, ordering and representing – Week 4 focus
Download the Lessonotes Mobile South Africa app for faster lesson access on Android and iPhone.
Subject: Mathematics
Class: Grade 1
Term: 1st Term
Week: 4
Theme: General lesson support
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Overview: This week, we continue our exciting journey into the world of numbers, focusing on the range from 0 to
2
0. Building on previous knowledge, this lesson deepens learners' understanding of how numbers are related to each other. In South Africa, numbers are all around us: counting the beads on a Zulu necklace, sharing amagwinya (vetkoek) with friends, counting the taxis in a rank, or checking the price of a cool drink at the spaza shop. Mastering numbers up to 20 is a critical foundation for all future mathematics.
This section explains the core ideas for understanding numbers 0-
2
0. A. Counting Forwards and Backwards Counting is the foundation. We can count forwards, which means the numbers get bigger (0, 1, 2, 3...). We can also count backwards, which means the numbers get smaller (20, 19, 18, 17...).
Why it's important: Counting forwards helps with addition. Counting backwards is the beginning of subtraction.
Example: Start at 11 and count forwards to 16: 11, 12, 13, 14, 15, 16.* Start at 19 and count backwards to 14: 19, 18, 17, 16, 15, 14.* We can use a number line to help us see the numbers moving forwards (to the right) or backwards (to the left). B. Representing Numbers A number is an idea. We can show it in different ways. Let's look at the number
1
7. Objects: We can use 17 real things, like stones, beads, or bottle tops. OOOOOOOOO OOOOOOOO (17 circles)
Number Symbol: This is the quick way we write it: 17 Number Name: This is how we write it in words: seventeen Decomposition (Breaking Down): This is a very important skill! We look at how many tens and units (ones) are in the number. The number 17 is made of one group of 10 and 7 extra units.
We can show this with blocks: a rod of 10 blocks and 7 single blocks.
We can write it as an equation: 17 = 10 + 7 C. Ordering and Comparing Numbers This means we look at two or more numbers and decide which is bigger, which is smaller, or if they are the same.
Key Terms: More than / Greater than / Bigger: The number that has a higher value.
Less than / Fewer than / Smaller: The number that has a lower value.
The same as / Equal to: The numbers have the exact same value.
Question: Zola has 15 sweets. Bongi has 12 sweets. Who has more sweets?
Step 1: Look at the two numbers: 15 and
1
2. Step 2: Think about counting. The number that you say later when counting from 0 is the bigger number.
Step 3: We say 12 first, then 13, 14, and then
1
5. So, 15 comes after
1
2. Answer: 15 is more than
1
2. Zola has more sweets.
Ordering from smallest to biggest (ascending order):
Example: Order these numbers: 18, 11, 20,
1
5. Step 1: Find the smallest number. Look at the 'tens' part. They all have one ten, except 20 which has two tens. So 11 is the smallest of the teens. 11 is the smallest overall.
Step 2: Look at the remaining numbers: 18, 20,
1
5. The next smallest is
1
5. Step 3: Look at the remaining numbers: 18,
2
0. The next smallest is
1
8. Step 4: The last number is 20, which is the biggest.
Answer: 11, 15, 18,
2
0.
Guided Practice (With Solutions)
Question 1: Look at the picture of the soccer balls below.
⚽⚽⚽⚽⚽ ⚽⚽⚽⚽⚽ ⚽⚽⚽⚽
a) Count how many soccer balls there are.
b) Write the number symbol.
c) Write the number name.
d) How many groups of ten can you make? How many units are left over?
Solution and
Commentary:
a) We count each ball one by one. There are 14 soccer balls.
b) The number symbol for fourteen is 14.
c) The number name is fourteen.
d) We can circle one group of ten balls (⚽⚽⚽⚽⚽ ⚽⚽⚽⚽⚽). After making one group of ten, we can see there are 4 balls left over. So, there is one ten and four units.
Question 2: Arrange these numbers on a number line from biggest to smallest: 19, 13, 17,
1
0.
Solution and
Commentary:
Method: To order from biggest to smallest, we find the largest number first.
Step 1: Look at the numbers: 19, 13, 17,
1
0. The biggest number is the one that is furthest along the number line from
0. In this case, it is
1
9. Step 2: From the remaining numbers (13, 17, 10), the next biggest is
1
7. Step 3: From the remaining numbers (13, 10), the next biggest is
1
3. Step 4: The last and smallest number is
1
0. Answer: The correct order is 19, 17, 13, 10.