Lesson Notes By Weeks and Term v5 - Grade 1
Addition and subtraction within 10 – Week 7 focus
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Addition and subtraction within 10 – Week 7 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: 7
Theme: General lesson support
This page supports the lesson note with a companion video and a short classroom-ready summary.
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This week, we're diving deeper into addition and subtraction within
1
0. This is a super important skill, because we use it every day! Imagine you're at the tuck shop buying sweets, or sharing snacks with your friends, or even helping your family count change when you go to the market. Knowing how to add and subtract helps us understand how much we have, how much we need, and how much is left. It helps us share fairly and solve problems in our everyday lives, from playing games to helping out at home. Being able to work with numbers up to 10 confidently sets us up for success in all future maths lessons.
Addition: Addition is putting things together. It's like when you have 2 apples and your friend gives you 3 more. To find out how many you have in total, you add them! We use the "+" sign to show addition. So, 2 + 3 =
5. This means 2 and 3 together make
5. Subtraction: Subtraction is taking things away. It’s like when you have 5 sweets and you eat 2 of them. To find out how many you have left, you subtract! We use the "–" sign to show subtraction. So, 5 – 2 =
3. This means if you start with 5 and take away 2, you are left with
3. Number Sentences: A number sentence is a mathematical statement that shows a relationship between numbers. It includes numbers, operation signs (+ or -), and an equals sign (=).
For example: 3 + 4 = 7 is a number sentence.
Using Fingers and Counters: We can use our fingers or counters (like small stones, bottle tops, or beads) to help us add and subtract. For example, if we want to add 4 + 3, we can hold up 4 fingers on one hand and 3 fingers on the other hand, then count all the fingers together.
Example 1 (Addition): Thando has 3 oranges. Ayanda gives him 4 more oranges. How many oranges does Thando have in total?
Explanation: We need to add the number of oranges Thando started with and the number Ayanda gave him.
Calculation: 3 + 4 = ?
We can use our fingers. Hold up 3 fingers on one hand and 4 fingers on the other. Count all the fingers. There are 7 fingers.
Answer: Thando has 7 oranges.
Example 2 (Subtraction): Zanele has 8 beads. She gives 2 beads to her friend Nomusa. How many beads does Zanele have left?
Explanation: We need to subtract the number of beads Zanele gave away from the number she started with.
Calculation: 8 – 2 = ?
We can use counters. Place 8 counters on the table. Take away 2 counters. Count how many are left. There are 6 counters.
Answer: Zanele has 6 beads.
Example 3 (Addition with a Number Line): Use a number line to solve 2 + 5 = ?
Explanation: We start at the number 2 on the number line. Then we move 5 places to the right (because we are adding).
Number Line:
```
0--1--2--3--4--5--6--7--8--9--10
^ ^
Start Move 5 spaces
to the right
```
Answer: We land on the number
7. So, 2 + 5 =
7.
Example 4 (Subtraction with a Number Line): Use a number line to solve 9 - 3 = ?
Explanation: We start at the number 9 on the number line. Then we move 3 places to the left (because we are subtracting).
Number Line:
```
0--1--2--3--4--5--6--7--8--9--10
^ ^
Start Move 3 spaces
to the left
```
Answer: We land on the number
6. So, 9 - 3 =
6.
Guided Practice (With Solutions)
Question: Sipho has 5 marbles. He finds 3 more marbles. How many marbles does Sipho have now? Write a number sentence to show this.
Solution:
We need to add the number of marbles Sipho started with and the number he found.
Number sentence: 5 + 3 = ?
Using counters: Put down 5 counters. Then put down 3 more counters. Count all the counters. There are 8 counters.
Answer: Sipho has 8 marbles.
Question: Aisha has 7 pencils. She gives 1 pencil to her brother. How many pencils does Aisha have left? Write a number sentence to show this.
Solution:
We need to subtract the number of pencils Aisha gave away from the number she started with.
Number sentence: 7 – 1 = ?
Using fingers: Hold up 7 fingers. Then put down 1 finger. Count how many fingers are still up. There are 6 fingers.
Answer: Aisha has 6 pencils.
Question: Complete the number sentence: 4 + ____ = 6
Solution:
We need to find the missing number that, when added to 4, gives us
6. Using counters: Put down 4 counters. How many more counters do we need to add to get to 6? Add counters one by one until we have
6. We added 2 counters.
Answer: 4 + 2 =
6. The missing number is
2. Question: Complete the number sentence: 8 - ____ = 5
Solution:
We need to find the missing number that, when subtracted from 8, gives us
5. Using counters: Put down 8 counters. Take away counters one by one until we have 5 left. We took away 3 counters.
Answer: 8 - 3 =
5. The missing number is
3.
Independent Practice (Questions Only)
David has 6 toy cars. He gets 2 more for his birthday. How many toy cars does David have now?
Nandi has 9 sweets. She eats 4 sweets. How many sweets does Nandi have left?
Complete the number sentence: 2 + ____ = 8
Complete the number sentence: 7 – ____ = 3
Sipho picks 4 mangoes from a tree and Thandi picks 5 mangoes. How many mangoes do they have altogether?
Maria had 10 rand. She spent 3 rand at the tuck shop. How much money does Maria have left?
5 + 2 = ?
9 – 6 = ?
Nomsa has 3 dolls, and her sister gives her 2 more dolls. How many dolls does Nomsa have now?
Peter had 7 balloons, but 1 floated away. How many balloons does Peter have left?