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Mathematics
  Prathomsuksa 2
Addition
   and
Subtraction
Adding and Subtracting
Vocabulary




 minus
Vocabulary




  plus
Vocabulary




change
Structure

• How many?
• How much?
How many?
• Followed by plural noun
  For examples
• How many pens do you have?
• How many pets do you have?
How much?
• Followed by an uncountable noun
  For examples
• How much sugar do you have?
• How much money do you have?
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
      50
     40+10 = ?
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
Example
 Yes, please. I     Welcome to SS’ toy.
would like to buy
     toys.
                     May I help you?
Example
               A tennis is 12 .
How much are   A Barbie is 25 .
   they?         12+25 = 37
Example
I give you       50 – 37 = 13




     Thank you   Here is 13 in
                    change.
20
12                         15


     28    25        35



30                        25
          24

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