Lesson Notes By Weeks and Term v5 - Grade 1
Addition and subtraction within 10 – Week 10 focus
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Addition and subtraction within 10 – Week 10 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: 10
Theme: General lesson support
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This week, we will continue exploring addition and subtraction, but with a specific focus on working with numbers within
1
0. Understanding addition and subtraction is like learning the secret codes to solving problems in our everyday lives. Imagine you are at the tuck shop buying sweets, or sharing oranges with your friends – these skills help us work out how many we have, or how many more we need. They are essential for budgeting our pocket money and understanding quantities. This topic is also important because it is the foundation for learning bigger numbers and more complex maths concepts in later grades. If we don't understand it well now, we might struggle later on.
What is Addition? Addition is putting things together. We use the "+" (plus) sign to show that we are adding. When we add, the number of things usually gets bigger.
Think of it like this: if you have 2 apples and your friend gives you 3 more apples, you now have a larger amount of apples. We can write this as 2 + 3 =
5. Example 1: Using Objects Imagine you have 4 marbles in your hand. Your friend gives you 2 more marbles. How many marbles do you have altogether?
Start: 4 marbles. You can use real marbles, counters, or draw 4 circles.
Add: Add 2 more marbles (or draw 2 more circles).
Count: Count all the marbles (or circles). You have 1, 2, 3, 4, 5, 6 marbles.
Write: 4 + 2 = 6 Example 2: Using Drawings Let's say Thandi has 3 bananas and Sipho gives her 1 more banana. How many bananas does Thandi have in total?
Draw: Draw 3 bananas.
Draw More: Draw 1 more banana next to the first
3. Count: Count all the bananas you drew. There are 1, 2, 3, 4 bananas.
Write: 3 + 1 = 4 What is Subtraction? Subtraction is taking things away. We use the "–" (minus) sign to show that we are subtracting. When we subtract, the number of things usually gets smaller. Imagine you have 5 sweets, and you eat 2 of them. You now have a smaller amount of sweets. We can write this as 5 - 2 =
3. Example 3: Using Objects You have 7 oranges. You give 3 oranges to your little sister. How many oranges do you have left?
Start: 7 oranges. Use real oranges, counters, or draw 7 circles.
Take Away: Take away 3 oranges (or cross out 3 circles).
Count: Count the oranges (or circles) that are left. You have 1, 2, 3, 4 oranges left.
Write: 7 - 3 = 4 Example 4: Using Drawings Nomusa has 8 flowers in her garden. She picks 2 flowers to give to her mother. How many flowers are left in the garden?
Draw: Draw 8 flowers.
Take Away: Cross out 2 flowers, because Nomusa picked them.
Count: Count the flowers that are not crossed out. There are 1, 2, 3, 4, 5, 6 flowers left.
Write: 8 - 2 = 6 Number Bonds Number bonds are pairs of numbers that add up to a specific number. For example, the number bonds of 5 are: 1 + 4 = 5 2 + 3 = 5 0 + 5 = 5 5 + 0 = 5 4 + 1 = 5 3 + 2 = 5 Knowing number bonds helps us to quickly solve addition and subtraction problems. If we know that 2 + 3 = 5, then we also know that 5 - 2 = 3 and 5 - 3 =
2. Example 5: Finding Number Bonds What two numbers add up to 7?
Think: 1 + ? = 7. 1 + 6 = 7 Think: 2 + ? = 7. 2 + 5 = 7 Think: 3 + ? = 7. 3 + 4 = 7 Therefore, 1 and 6, 2 and 5, and 3 and 4 are all number bonds of
7. Guided Practice (With Solutions)
Question 1: Sipho has 3 cows. He buys 4 more cows. How many cows does Sipho have altogether?
Solution: Identify: We need to add the number of cows.
Write: 3 + 4 = ?
Calculate: Use counters (stones or beans) or draw circles. Start with 3 counters and add 4 more. Count them all.
Answer: 3 + 4 =
7. Sipho has 7 cows altogether.
Question 2: Maria has 9 books. She gives 5 books to her friend. How many books does Maria have left?
Solution: Identify: We need to subtract the number of books Maria gave away.
Write: 9 - 5 = ?
Calculate: Use counters or draw circles. Start with 9 counters and take away
5. Count how many are left.
Answer: 9 - 5 =
4. Maria has 4 books left.
Question 3: What is 2 + 5?
Solution: Write: 2 + 5 = ?
Visualize: Imagine 2 sweets and then 5 more sweets.
Count: Count the sweets in your mind or use your fingers.
Answer: 2 + 5 = 7 Question 4: What is 8 - 3?
Solution: Write: 8 - 3 = ?
Visualize: Imagine 8 balloons, then 3 float away.
Count: Count how many balloons are still there (in your mind, use fingers, or draw a picture)
Answer: 8 - 3 = 5 Independent Practice (Questions Only) Nomsa has 6 pens. John gives her 3 more pens. How many pens does Nomsa have in total? Peter had 10 biscuits. He ate 4 biscuits. How many biscuits does Peter have left? What is 4 + 4? What is 9 - 2? There are 5 children playing in the park. 2 more children join them. How many children are playing in the park now? Sarah has 7 crayons. She loses 1 crayon. How many crayons does Sarah have left?
Complete the number bond: 3 + ? = 8 Complete the number bond: ? + 2 = 6 What is 1 + 8? What is 6 – 4?