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MATH GRADE 2: Commutative Property of Addition
Commutative Property of Addition
I. Learning Objectives
Cognitive: Show the commutative property of addition in adding numbers
Psychomotor: Shows that changing the order of the addends does not affect the sum
Affective: Practice helping at home
II. Learning Content
Skill: Showing the commutative property of addition in adding numbers
Reference: BEC PELC I.B.4.1
Materials: cutouts of a big tree with cutouts of fruits, picture cards, Show-Me-Boards
III. Learning Experiences
A. Preparatory Activities
a. Think of two numbers in which the sum is 12.
b. Think of 2 addends in which the sum is 16.
c. What is the sum of 7 and 8?
d. What number is 3 more than 9?
e. Combine 8 and 9.
a. Look at the cutouts of fruits in the big tree posted on the board.
b. Listen to the teacher's directions as stated below:
Find the sum of the numbers that have 3 ones.
Find the sum of the numbers that have 3 hundreds.
Find the sum of the numbers that have 4 tens.
Find the sum of the numbers that have 4 hundreds.
Find the sum of the numbers that have 2 tens.
Game: "Let's Change Places" (5 pairs only)
a. Pupils get a partner.
b. Each pair stands on tip toe on a rectangle, the size of a yellow pad.
c. Partners change position when they hear the teacher say: "Exchange places."
d. Pairs of partners who step out of the rectangle are out of the game.
e. The pair who survives wins.
f. Now we are going to do a lot of exchanging places in our game and with the addends of the addition sentence like the illustration shown on the board.
B. Developmental Activities
Look at the picture of balloons.
a. What addition sentence can you give for the first picture? second picture?
b. What are the addends?
c. What do you notice about the position of the addends? Did the addends change?
d. What is the sum of 3 and 2? What is the sum of 2 and 3?
e. What can you say about the sum? Are they equal? Why?
* Tell the pupils that this illustrates the order property of addition which is called commutative property.
2. Group Activities
a. Distribute picture cards as shown below (at least 5 pictures cards.)
b. Write an addition sentence. Then change the order of the addends.
c. Write the answer on your "Show-Me-Board."
a. Flash cards with addition sentences.
Example: 8 + 6 = __ + 8
b. Give the missing number and find the sum.
Change the order of the addends. Then find the sum.
a. 502 + 30
b. 425 + 48
c. 310 + 156
d. 693 + 102
e. 236 + 234
How do we show the commutative property of addition?
Solve the following word problems.
Julio and June are good friends. One day they helped June's father gather mangoes and santol. Julio gathered 110 mangoes and 105 santol. June gathered 105 mangoes and 110 santol. Who gathered more mangoes and santol?
How did Julio and June help June's father?
What trait did they show?
Do you also help your father and mother? How?
1. Write the missing number to show the commutative property of addition.
a) 8 + 12 = ___ + 8
b) 27 + ___ = 42 + 27
c) ___ + 85 = ___ + 16
d) 312 + 526 = ___ + ___
e) 600 + ___ = 217 + ___
2. Change the order of addends. Then find the sum.
421 + 35 =
510 + 69 =
243 + 326 =
512 + 277 =
Complete the number sentences by changing the order of the addends.
1) 17 + 4 = ___ + ___ = ___
2) 25 + 7 = ___ + ___ = ___
3) 461 + 26 = ___ + ___ = ___
4) 306 + 120 = ___ + ___ = ___
5) 540 + 109 = ___ + ___ = ___
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