Properties of Addition Video Lecture | General Mathematics for Primary 4

0:0:0: hello students today we are going to
0:0:2: learn about properties of addition in
0:0:6: this video we will learn about three
0:0:8: properties of addition order property
0:0:12: additive property and grouping or
0:0:15: associative property the first one is
0:0:18: order property order property states
0:0:21: that rearranging the numbers does not
0:0:23: affect the sum of
0:0:25: numbers for example 2 + 3 = 5
0:0:30: and also 3 + 2 = 5 consider this
0:0:35: example what is the sum if you add them
0:0:38: starting from the leftmost
0:0:40: digit let's see 2 + 4 + 6 + 9 + 5 is
0:0:46: equal to
0:0:47: 26 now what is the sum if you add them
0:0:50: starting from the rightmost digit let's
0:0:54: see 5 + 9 + 6 + 4 + 2 it is also Al
0:1:0: 26 see the sum of numbers is the same so
0:1:5: the order of number does not affect the
0:1:8: sum easy right try these use the order
0:1:13: property to find the missing
0:1:19: numbers let's see the answers now so
0:1:22: students how many of your answers were
0:1:26: correct great now the second property is
0:1:31: additive property the sum of any number
0:1:34: and zero is that number
0:1:36: itself this is called the additive
0:1:39: property of 0er so for example 5 + 0 is
0:1:44: equal to 5 consider this
0:1:47: example what is the sum if you add any
0:1:50: of the number on the left with zero
0:1:52: let's take a number from here and see 4
0:1:56: + 0 = 4 9 + 0 0 is equals to
0:2:2: 99 so any number that is added to zero
0:2:5: the sum is always that number itself try
0:2:9: these on your own use the additive
0:2:12: property to find the missing
0:2:17: numbers let's see the answers
0:2:20: now so students how many of your answers
0:2:24: were
0:2:24: correct great now the third and last
0:2:28: property is group or associative
0:2:31: property it states that changing the
0:2:33: grouping of the numbers using brackets
0:2:35: does not affect the sum of numbers so 2
0:2:39: + 3 + 4 is equal to 2 + 3 + 4 do you
0:2:44: guys like
0:2:45: fruits consider this example add up all
0:2:49: red fruits first then add the
0:2:52: bananas that becomes 2 + 4 + 3 2 + 4 is
0:2:58: the sum of red fruits
0:3:0: and three is the number of
0:3:2: bananas so the answer is 6 + 3 which
0:3:7: equals to 9 so the total number of
0:3:11: fruits is nine now add bananas and
0:3:14: strawberries together then add the
0:3:16: apples the sum of bananas and
0:3:19: strawberries is 3 + 4 and the number of
0:3:22: apples is two so the addition becomes 3
0:3:27: + 4 + 2
0:3:30: that is 7 + 2 which is also
0:3:34: 9 so the total number of fruits here is
0:3:38: nine so did the total number of fruits
0:3:41: change no the total number of fruits is
0:3:45: nine only so this proves the grouping
0:3:49: property now let's recall what we have
0:3:52: learned in this video group the sticky
0:3:55: notes correctly under the two
0:3:58: headings let's see the answers now so
0:4:2: students how many did you group
0:4:5: correctly this brings us to the end of
0:4:7: this
0:4:8: video we hope that you have understood
0:4:11: properties of
0:4:12: addition now you can test what you have
0:4:15: learned in this video by attempting
0:4:16: tests on our urv app you can also learn
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0:4:35: exams thank you