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Give and Take


Give and Take

CBSE, Maths, Class – III, Unit – 3

P.Poornima,D.Sankaradevi

Prior knowledge: Addition and subtraction of two digit numbers with and without regrouping as tens.

Major Concepts: Addition and Subtraction

Learning objectives: Students will be able to do the following:

  • Add  and  subtract  numbers  by  writing them vertically and horizontally with and without regrouping.
  • Frame problems for addition and subtraction.
  • Expand  a  number  using the concept of place value.

Learning Resources: Textbook, blackboard, worksheet, beads and YouTube videos.

ENGAGE

Activity 1: Watching a video

The teacher plays a video  on  addition from youtube.com. Children enjoy and learn the song.

h t t p s: / / w w w. yo u t u b e. co m / watch?v=Mn7fmBOmrQ8

h t t p s: / / w w w. yo u t u b e. co m / watch?v=JFjHid8Hgek

Assessment: Teacher asks a few questions about this video to check their understanding.

Activity 2 – ‘Snakes and Ladders’

The   teacher   forms   groups   of   4   students and asks them to play the game of snakes and ladders. While playing the game, she relates the forward move (ladder) to addition and backward move (snake) to subtraction.

Assessment: Teacher visits the groups at random and asks children to explain one or two moves using dices.

EXPLORE

Activity 1 - Grouping the dots:

Teacher gives an activity to children to group the dots into tens. After the activity teacher could ask a few questions such as 1) How many groups of 10 are there and how many ones are remaining

2) Has anyone formed more than 2 groups? etc.

Assessment:    Teacher    reviews    students’

worksheet.

Activity 2 - Number line:

Using     the  number  line  worksheet  which has numbers 1- 100 (or number gird 1-100 in vertical  format)  the  teacher  asks  students  to

select  any  number  and  jump  10  or  5.  They could jump 2 or 3 also because it will help them understand  it  more  easily.  For  that,  the teacher could create a new number line worksheet. Teacher should ask students to mark five small lines in-between the two numbers (e.g. between 5 and 10) so that if students choose 22 or 44, it will help them to understand from where to start.

Skip counting (jump up) in 10s using the table below.

Number grid

For example

•  22+30 = 22+ 30 skip count (jump up) in

the table and find the number=52

•      34+10

•      44+20

•      20 more than 31

And also using the same procedure for back ward jump.

  •     53-20
  •   8 less than 50

EXPLAIN

The teacher asks the students to explain what they have understood in each activity performed so far. The teacher also explains the concepts wherever required.

Assessment: Teacher asks questions, gives some more activities to repeat or gives a few sums based on the concepts.

ELABORATE

 

Activity 1 – Decomposing numbers:

 

Teacher  gives  an  activity to the children to decompose  the  numbers.  In  this  activity students could choose any number and decompose  it  as  groups  of  10  and  mention the  remaining  remainder.  For  example  if student takes 33, 33 = 10+10+10 +3 if student takes 38, 38 = 10+10+10+8

Assessment: Students ability to decompose numbers.

Activity 2 - Puzzle game:

Teacher  gives  jumbled  puzzles  to  the students. They have to assemble it using decomposition of numbers. Teacher could give any number and ask students to match as many combinations as possible using this chart and also write it in their note books. (Teacher should prepare a few more cards like this.)

Assessment:    Teacher    observes    students

while  performing  the  activity  and  also  checks their notebooks.

EVALUATE

Activity 1 – Addition puzzle:

Students solve a collection of puzzles in which they add, subtract, and use logical reasoning to find missing numbers in a 3 × 3 grid. Through multiple   random   challenges,   students   work to improve their strategies and scores. The activity concludes with students identifying the strategies they used to solve the puzzles.

Addition puzzle game: Fill in the grids:

Number

Decompose into three numbers

50

10

 

 

 

20

20

 

23

10

10

3

70

10

50

10

 

 

Number

Decompose into  three  numbers, add and verify

34

4

 

 

26

 

 

6

45

 

10

 

Activity 2 - Decomposition worksheet:

Teacher gives  a worksheet and asks students

to do the following:

•      Add the given numbers

•      Decompose the second number in such a manner that the first number becomes 10 (eg., 6+8 = 14; 8 must be decomposed to

4+4 so that it becomes 10+4)

Note:  Teacher  could  extend  the  worksheet  as required.

Assessment:   Teacher   checks   the   worksheet completed by the students.

 

Grade: 
3

Subject: 
Primary Maths

Term: Term 2