MathematicsPrathomsuksa 2

Addition and

Subtraction

Adding and Subtracting

Vocabulary

minus

plus

Vocabulary

Vocabulary

change

Structure

• How many?• How much?

How many?

• Followed by plural nounFor examples• How many pens do you have?• How many pets do you have?

• Followed by an uncountable nounFor examples• How much sugar do you have?• How much money do you have?

How much?

Question

1. How much money did the man give to Carlos?: Two quarter or 50 cents.

2. How many dimes make 50 cents?: 5 dimes

How many fruits are there in all?

There are 6 apples and 5 oranges.How many fruits are there in all?

11

How many fruits are there in all?

14

Your turn

11

15

15

16

How much is it?

40 ฿ 10฿

40+10 = ?50 ฿

30 ฿

Role play• Situation: You are in the toy shop• Direction• Work in pair• One is an shopkeeper and another is a

costumer.• A costumer has 70 ฿• A costumer has to choose 2 things• A shopkeeper has to change money

ExampleWelcome to SS’ toy.

May I help you?

Yes, please. I would like to buy

toys.

How much are they?

ExampleA tennis is 12 ฿.A Barbie is 25 ฿.

12+25 = 37 ฿

I give you

Example

50 – 37 = 13฿

Here is 13 ฿ in change.

Thank you

12฿ 15฿20฿

35฿25฿28฿

30฿ 24฿ 25฿