• 2 months ago
Transcript
00:00Welcome to the chapter Patterns.
00:16This slide presents the overview of the chapter.
00:22Learning Objectives
00:23By the end of this chapter you will be able to
00:29Understand how the patterns are different and have equal halves
00:33Explain why some numbers will not have at least a line which divides it into half
00:40Understand what the number patterns are
00:45Introduction
00:46In our daily life we see different objects, things and living beings etc. which look alike
00:53when they are folded in half.
00:58Have you ever tried to do so?
01:06Let us try to find the objects or things which look alike.
01:12Let's have a look at the things which look alike.
01:16The pictures which when folded vertically appear such that one part coincides with the
01:22other half.
01:24Let us look at some examples from nature.
01:28If we place a mirror along the incomplete part we can see the other half which looks
01:34exactly like the remaining half of the image.
01:39Take up an activity to complete the other halves.
01:43Drag and drop the other missing halves of the figures given below.
02:02Now we shall observe the figures with multiple lines that divide the image into two equal
02:09halves.
02:10Take a squared paper.
02:12For the first time fold it into half horizontally and then unfold it.
02:18For the second time fold it into half vertically and then unfold it.
02:24For the third time fold the square into half diagonally flipping down side to up as shown.
02:32For the fourth time fold the square into half diagonally flipping up side to down as shown.
02:40Again open out the fold.
02:43From all the above foldings we observe that the square has four lines which can divide
02:49the square into two equal halves.
02:53Let's take an alphabet as shown on the screen.
02:57Can you make it into halves which look like each other?
03:02Absolutely not!
03:05Since the alphabet R cannot be divided into halves that look like each other, therefore
03:12there are some alphabet which we cannot make them half that look alike.
03:18Now let us do an activity to check the lines which divides the image exactly into two equal
03:26halves that look like each other.
03:56Now let us do an activity on making a mask.
04:09Click each tab to know more.
04:13Objective- The main objective of this activity is to make a mask.
04:22Procedure- Take a thick sheet of paper and fold it into half as shown on the screen.
04:30Now draw the design as shown above.
04:35Take a pair of scissors and cut along the edges where we have drawn earlier.
04:42Now unfold the paper.
04:45Now colour the mask as you wish to have.
04:51Observation- We have observed that the mask has been made by making the paper into two
05:00halves that look alike each other.
05:05Now we will do an activity on shapes.
05:11Identify the shapes from the given figure.
05:42Now we will study about the number patterns.
05:49A number pattern is a series of numbers that follow a rule.
05:55For example, here the matchsticks are arranged in a pattern by following a number rule of
06:02increasing it by one number.
06:05Here the number of matchsticks keeps increasing by one that is 3, 4, 5, 6 and 7.
06:15In another example, here is a number pattern.
06:19Look at the sequence of numbers.
06:22Can you guess the next number?
06:25In this number pattern, start at 1 and add 2 each time.
06:301 plus 2 is equal to 3.
06:333 plus 2 is equal to 5.
06:36Keep adding 2 each time.
06:38The next numbers are 7 and 9.
06:42After the number 9, the next number will be 9 plus 2 equal to 11.
06:49This number pattern is an increasing number pattern by the rule of addition of 2.
06:56In another example, here is a number pattern.
07:01In this number pattern, start at 17 and subtract 3 each time.
07:0817 minus 3 is equal to 14.
07:1114 minus 3 is equal to 11.
07:15Keep subtracting 3 each time.
07:18The next number will be 5 minus 3 which is equal to 2.
07:23This number pattern is a decreasing number pattern by the rule of subtraction of 3.
07:30Look carefully at the given number series.
07:342, 4, 6, 8.
07:38Here the number starts at 2 and add 2 each time.
07:432 plus 2 equal to 4.
07:464 plus 2 equal to 6.
07:49Keep adding 2 each time.
07:53Let us solve some exercise problems.
08:07Let us perform an activity on number patterns.
08:11Identify the next number in the series by clicking the button.
08:30Try to solve the questions on your own in the practice zone.
08:34Click solution tab to verify your answers.
08:41Summary
08:44Let us recap the highlights of this chapter.
08:48A pattern is a set of shapes or numbers or alphabet that are repeated over and over again.
08:56We have seen the things which can be made into equal halves.
09:00We also learnt the number patterns and different shapes.
09:06Which of the numbers from 1 to 10 can be divided into equal halves?
09:12Also, draw the line which divides the number into halves.
09:17Look around you.
09:19State which are the objects that can be divided into halves that look alike.
09:27Look around you.
09:29State which are the objects that can be divided into halves that look alike.
09:35Identify the number pattern in the series 20, 30, 40, 50.
09:43Test your understanding of the chapter by taking the mock unit test.
09:56You have successfully completed the chapter Patterns.