Lesson Notes By Weeks and Term v5 - Grade 1

Lesson Video

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Performance objectives

• Solve addition problems with numbers up to 34
• Solve subtraction problems with numbers up to 34
• Solve simple word problems
• Understand the symbols +, -, and =
• Explain how you solved a problem

Lesson summary

This week, we'll be building on our knowledge of numbers from 0 to

3

4. We will learn how to solve simple addition and subtraction problems within this range. Understanding these skills is very important because we use them every day! Imagine you are buying sweets at a spaza shop, or sharing oranges with your friends. You need to add up how much money you're spending or how many oranges each person gets. These skills also help us understand bigger numbers as we grow older.

Lesson notes

Addition: Addition is when we put things together. The ‘+’ sign tells us to add. For example, 2 + 3 means we are adding 2 and 3 together. We count all of them to find the total. We use the ‘=’ sign to show the answer. So, 2 + 3 =

5. Subtraction: Subtraction is when we take things away. The ‘–’ sign tells us to subtract. For example, 5 – 2 means we are taking 2 away from

5. We count how many are left. So, 5 – 2 =

3. Concrete Objects: These are things you can touch and count, like stones, beans, pencils, or sweets. We can use these to help us add and subtract.

Drawings: If we don't have objects, we can draw pictures to help us add and subtract. For example, we can draw circles or squares.

Word Problems: These are stories that ask us to add or subtract. We need to read the story carefully to understand what it is asking us to do. Look for words like "altogether," "total," "left," or "take away."

Examples: Addition: Example 1: Zanele has 12 marbles. Thando gives her 5 more marbles. How many marbles does Zanele have altogether? We need to add 12 and

5. We can draw 12 circles and then draw 5 more circles.

Count all the circles: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

1

7. Zanele has 17 marbles altogether. 12 + 5 = 17 Example 2: A farmer has 21 chickens and buys 8 more. How many chickens does the farmer have in total? We need to add 21 and

8. We can use base ten blocks to represent 21 (2 tens and 1 unit). Then we add 8 more units.

Count the blocks: 2 tens and 9 units. The farmer has 29 chickens in total. 21 + 8 = 29 Subtraction: Example 1: Sipho has 18 sweets. He eats 6 sweets. How many sweets does Sipho have left? We need to subtract 6 from

1

8. We can draw 18 circles and then cross out 6 circles. Count the circles that are not crossed out: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,

1

2. Sipho has 12 sweets left. 18 – 6 = 12 Example 2: Maria has 34 beads. She gives 11 beads to her friend. How many beads does Maria have now? We need to subtract 11 from

3

4. We can use base ten blocks. 34 is 3 tens and 4 units. We take away 1 ten and 1 unit. We are left with 2 tens and 3 units. Maria has 23 beads left. 34 - 11 = 23 Guided Practice (With Solutions)

Question 1: There are 15 children playing soccer. 7 children join them. How many children are playing soccer now?

Solution: We need to find the total number of children, so we need to add. We add 15 +

7. We can draw 15 circles and then 7 more circles.

Count all the circles: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,

2

2. There are 22 children playing soccer. 15 + 7 = 22 Question 2: Lerato has 25 apples. She gives 10 apples to her neighbour. How many apples does Lerato have left?

Solution: We need to find how many apples Lerato has left, so we need to subtract. We subtract 10 from

2

5. We can use base ten blocks. 25 is 2 tens and 5 units. We take away 1 ten. We are left with 1 ten and 5 units. Lerato has 15 apples left. 25 – 10 = 15 Question 3: Peter has 9 toy cars. He buys 6 more toy cars. Then his brother gives him 4 more toy cars. How many toy cars does Peter have in total?

Solution: This problem has two steps of addition. First, we add the cars Peter buys: 9 + 6 = 15 Then, we add the cars his brother gives him: 15 + 4 = 19 Peter has a total of 19 toy cars.

Question 4: Sarah has 28 crayons. She loses 5 crayons and gives 3 crayons to her friend. How many crayons does she have left?

Solution: This problem has two steps of subtraction. First, we subtract the crayons she loses: 28 - 5 = 23 Then, we subtract the crayons she gives away: 23 - 3 = 20 Sarah has 20 crayons left. Independent Practice (Questions Only) John has 14 oranges. He eats 3 oranges. How many oranges does John have left? A baker makes 22 cupcakes. He sells 9 cupcakes. How many cupcakes are left? There are 16 birds sitting on a tree. 8 more birds fly to the tree. How many birds are on the tree now? A farmer has 27 sheep. He sells 12 sheep. How many sheep does the farmer have left? Lisa has 11 red beads and 13 blue beads. How many beads does she have in total? A shopkeeper has 32 bananas. He sells 10 bananas in the morning and 5 bananas in the afternoon. How many bananas does he have left? Sam has 7 pencils. His mom gives him 5 pencils, and his dad gives him 3 pencils. How many pencils does Sam have now? There are 24 children in a class. 6 children are absent today. How many children are present? Maria has 19 sweets. She gives 8 sweets to her friends. Then she eats 2 sweets herself. How many sweets are left? David has 15 marbles. He finds 7 more marbles. Then he loses 4 marbles. How many marbles does David have now?