Composing and Decomposing Numbers — Transcript

Full transcript

1. 0:02good day great one today we're going to
2. 0:04have a lesson that will surely be very
3. 0:07interesting for you and the title of our
4. 0:10lesson is
5. 0:11composing and decomposing numbers
6. 0:15now
7. 0:17let us find out what is composing
8. 0:20numbers
9. 0:21composing numbers is the process of
10. 0:24putting two numbers together
11. 0:26to make
12. 0:28a larger number
13. 0:30now how about decomposing numbers
14. 0:34decomposing numbers is the process of
15. 0:37breaking down numbers
16. 0:39into their
17. 0:40sub parts
18. 0:43now
19. 0:44this is an example of composing numbers
20. 0:48jerry has two bags to give to some
21. 0:51children in their community
22. 0:54while john has three
23. 0:56how many bags will they give in all
24. 0:59now these are the two bags of jerry
25. 1:02and the three bags of john
26. 1:05and when we are going to combine them
27. 1:08we will make five bags
28. 1:11so
29. 1:12when we combine two
30. 1:14and three together
31. 1:17we can compose the number five
32. 1:22another example
33. 1:24we have here the numbers one and four
34. 1:27now one is a part and four is a part so
35. 1:30what do you think will be the whole
36. 1:33very good five is the whole so one and
37. 1:37four together we will make five
38. 1:42another example
39. 1:44meg has three red pencils and four
40. 1:47yellow pencils
41. 1:49how many pencils does she have in all
42. 1:52so these are the three red pencils
43. 1:55and the four yellow pencils
44. 1:58and when we combine them
45. 2:00we will make seven pencils so
46. 2:04three
47. 2:05and four together
48. 2:07we can compose the number seven
49. 2:10there you go
50. 2:11so another example
51. 2:13we have here the numbers one and six
52. 2:16now if we combine them
53. 2:19we will make the number seven so one and
54. 2:23six are parts
55. 2:24of the number seven
56. 2:28this time let's have examples of
57. 2:31decomposing numbers
58. 2:34mr cruz bought eight donuts for his
59. 2:37neighbors mr tan and mr dal
60. 2:40he wanted to give equal number of donuts
61. 2:42for each of them
62. 2:44how many donuts will mr cruz give to his
63. 2:47neighbors so
64. 2:49these are the eight donuts
65. 2:51from mr cruz and
66. 2:54of course
67. 2:56he would give
68. 2:57four
69. 2:59to mr tan
70. 3:02and
71. 3:03another four
72. 3:05to mr dal so as you can see
73. 3:08eight
74. 3:09is a whole and then
75. 3:11the parts of eight are four
76. 3:14and four
77. 3:15there you go
78. 3:16so when we broke down eight into parts
79. 3:19we have four
80. 3:21and four
81. 3:24another example
82. 3:25eight
83. 3:27is the whole number
84. 3:28and three is a part of it
85. 3:31now what do you think is the other part
86. 3:35very good it's the number five so eight
87. 3:39when we break it into parts
88. 3:42we will have three
89. 3:44and we will have five
90. 3:48another example
91. 3:50mark had
92. 3:52nine matchbox cars
93. 3:55he was going to put the red match boxes
94. 3:58in the big box while the green ones
95. 4:01would be in the small box
96. 4:03how would he arrange them
97. 4:06so again these are the nine matchbox
98. 4:09cars
99. 4:10and
100. 4:13he would put the red matchboxes in the
101. 4:16big box
102. 4:17and the green ones would be in the small
103. 4:19box
104. 4:20so how would he arrange them
105. 4:23so again these are the nine
106. 4:26matchbox and
107. 4:30he would put
108. 4:32the red matchbox
109. 4:34cars
110. 4:35in the big box so how many red
111. 4:39matchbox cars did he have
112. 4:43very good
113. 4:45five
114. 4:46and
115. 4:48he would put
116. 4:49the green
117. 4:51matchbox cars into the smaller box so
118. 4:54how many
119. 4:56green
120. 4:57matchbox cars did he have
121. 5:00very good
122. 5:02four so as you can see when we broke
123. 5:05down
124. 5:06nine into parts
125. 5:08we have five as a part
126. 5:10and we also have four as a part
127. 5:13there you go
128. 5:15so another example
129. 5:17nine
130. 5:18is the number here and seven is a part
131. 5:22so what do you think is the other part
132. 5:25very good it's the number two so when we
133. 5:29broke down nine into parts
134. 5:32we have here seven and we have here two
135. 5:36very good my dear great one
136. 5:39now remember
137. 5:40composing numbers is the process of
138. 5:43putting two numbers together to make a
139. 5:46larger number
140. 5:47and decomposing numbers is the process
141. 5:50of breaking down numbers into their
142. 5:53subparts
143. 5:55good job my dear great one now you
144. 5:57already know how to compose and
145. 6:00decompose numbers