Grade 1 Mathematics Module 2: Second Quarter Jan 22-27Week 2(In English)

 

Mathematics 1, Module 2

Second Quarter, Week 2

January 22-29, 2021

Adding 2 up to 3 one-digit numbers using the appropriate method

Competency: Visualizes and adds the following numbers using appropriate techniques:

a. two one-digit numbers with sums up to 18.

b. three one-digit numbers.

Things to do

Good day children! Are you ready to learn our next lesson?

This lesson will give you a teaching on how to add 2 or 3 one-digit numbers that have a sum of up to 18 using the proper method.

Good day children! Are you ready for our lesson today? 

This lesson will teach you how to add 2 or 3 one digit numbers that have a sum up to 18 in the proper way.




Let us Learn (pg 2)

A. First Situation

1. Solve the problem.

Two friends Kyla and Dan went to the back of their houses to get some fruit. Kyla got 5 mangoes while Dan got 7 guavas. How many fruits do they have all in all?

Questions:

1. Who are friends?

2. What did they get?

3. Where did they get it?

4. What fruit did Kyla get? How many was it?

5. What fruit did Dan get? How many was it? 

> If Kyla got 5 mangoes and Dan got 7 guavas, they have 12 fruits.

> Let's write this sentence using numbers: 5+7=12.

(pg 3)

> Looking at it this way, if Dan got 7 guavas whike Kyla got 5 mangoes, they still have 12 fruits all in all.

> Let's write this sentence using numbers: 7+5=12.

Look at the pictures.

Addends- these are the numbers we add

Sum= answer in additon; the number after adding

> What can you say about the sum of 5+7 and 7+5?

Answer: The sum of 5+7 is the same as the sum of 7+5. The sum is both 12.


(pg 4)

> What can you say about the order of the addends? Did the sum change when the order of the addends were switched?

Answer: The order the addends do not change the sum. This is what you call the ORDER PROPERTY OF ADDITION.

Other examples:

9 + 6=15    6 + 9= 15

8 + 3=11    3 + 8= 11

B. Second Situation

1. Solve the Problem.

In addition, another friend of Kyla and Dan named Gab was able to get 3 oranges. How many fruits are there in total?

(pg 5)

> What is the correct number sentence?

Look at the pictures.

> How many addends are there?

Answer: 3

> Which numbers were added first to get a sum?

Answer: The addends inside the parenthesis. 

> What do you do next?

Answer: Add the sum of the 2 numbers in the parenthesis to the third number to get sum.

> Are the sums of (5+7)+3 and 5+(7+3) the same?

Answer: Yes.



(pg 6)

> What is the sum? 15

> Did the sum of the 2 groups of addends change?

Answer: No.

Changing the order of the addends does not change the sum. This is called the GROUPING PROPERTY OF ADDITION.

Take a look at the other examples.








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