Rounding Numbers Math Week 1; Day 4

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by Olivia Norris0 views·Updated Sep 16, 2020
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  1. Hello, Great for and welcome to today's lesson.
  2. Today's lesson is week one day four of your maths
  3. learning journey.
  4. Really excited that you've joined me here again today Before
  5. we get started.
  6. It's important that we gather all of our materials, so
  7. make sure you have your workbook, your pencil and you're
  8. a razor.
  9. If you haven't got those ready, pause the video and
  10. then join us when you do.
  11. Okay, thank you so much for getting all of your
  12. things ready.
  13. So today we are going to be learning about rounding.
  14. We will learn to round numbers to the nearest 1000
  15. or 1000 before we start.
  16. It's important that we review what we have learned so
  17. far about place value, as we need to understand place
  18. value in order to round numbers.
  19. Every number is made out of digits.
  20. Every digit in a number has a place and that
  21. place has a value.
  22. A number can be in the ones place the tens,
  23. place the hundreds place on DSO on understanding place value
  24. helps us to write numbers.
  25. It also helps us to add on subtract.
  26. But what we need to think about today is what
  27. is rounding.
  28. When we talk about rounding, we're talking about simplifying a
  29. number. Rounding involves making a number simpler by changing it
  30. to its closest value, that it's easier toe work with,
  31. which is really helpful when you're doing mental math.
  32. When do we round?
  33. Rounding is helpful in a lot of situations.
  34. We come round in situations where a precise calculation isn't
  35. necessary, such as when you want to know how Maney
  36. marbles are in a jar.
  37. You can also round when you want to know how
  38. long something is or when you want to know how
  39. much groceries will cost.
  40. When you round Numbers you are estimating estimation is an
  41. approximate calculation, the results of estimating maybe less accurate.
  42. But it's useful in situations where a precise calculation isn't
  43. necessary. When you need a precise answer, you will not
  44. be able to use rounded numbers.
  45. Now let's think about how we round.
  46. So how do we round?
  47. You can choose any place value to round a number
  48. two, depending on your needs.
  49. All you have to do is follow some simple rules.
  50. Let's look at the number 58 when we want around
  51. 58 to the nearest 10 we can use that.
  52. We could do that.
  53. Using a number line we have to round to the
  54. nearest 10 which means that we have to count in
  55. steps of 10 on a number line.
  56. I am going to locate 58 on the number line,
  57. which 10 is closer.
  58. 50 or 60 60 is definitely closer.
  59. This means that 58 is rounded to the nearest 10
  60. as 60.
  61. There you can see 50 to 60.
  62. 58 is there.
  63. The nearest 10 is 60.
  64. Let's practice some more.
  65. I want around 33 to the nearest 10.
  66. As we're running to the nearest 10 we can count
  67. in steps of 10 so we need to draw a
  68. number line with intervals off.
  69. 10 33 falls between the 30 on 40.
  70. Now we need to zoom in on this part of
  71. the number line.
  72. Now I'm going to locate 33 on my number line,
  73. which 10 is closer.
  74. 30 or 40 30 is closer.
  75. Which means that 33 rounded to the nearest 10 is
  76. 30. Let's try a different number.
  77. Let's have a look at the number 95 so 95
  78. falls between the 90 and the 100 I need to
  79. zoom on in this part of the number line as
  80. well. So here you can see I have pit 95
  81. on the number line.
  82. What do you notice about this number?
  83. It is an equal distance between 90 on 100.
  84. What should we do now?
  85. Remember last year you watched the brain pop video on
  86. rounding. Moby was cycling over rounding machine and he told
  87. us that when we're looking at a five, we should
  88. always round up.
  89. So from 95 if we round up, that would be
  90. 100. Now let's she's a poem to help us round
  91. the number 457 to the nearest 10.
  92. So there you can see 457.
  93. First, we need to underline the digit.
  94. As we're rounding to the nearest 10 we need to
  95. underline the digit in the tens place, which is the
  96. five now that she's a poem to help us to
  97. round the number 457 to the nearest 10.
  98. First we look at the number on, we need to
  99. underline the digit as we ran into the nearest 10.
  100. We need to underline the digit in the tens Plage,
  101. which is the five.
  102. It then tells us to look next door.
  103. This means we look at the number in the place
  104. before, which is in the ones place.
  105. This number here is a seven.
  106. It then tells us that if the digit before the
  107. five ISMM or we round up, But if the digit
  108. is less than five, we round down seven is more
  109. than five.
  110. So we round up.
  111. That means that 457 rounded to the nearest 10 is
  112. 460. Now let's try it.
  113. With a bigger number, we want around 4679 to the
  114. nearest 10.
  115. First, we underline the digit.
  116. As we're rounding to the nearest 10 we underline the
  117. digit in the tens place that is the seven.
  118. Now we look at the digit next door, which is
  119. in the ones place the digit is nine nine is
  120. more than five.
  121. So we round.
  122. Uh huh.
  123. This means that 4 4679 rounded to the nearest 10
  124. is 4680.
  125. Now it's time for you to have a go independently
  126. round thes numbers to the nearest 10.
  127. Remember to look for the digit in the tens.
  128. Place on, look for the number next door.
  129. Pause the video now and come back when you've completed
  130. your answers and we'll mark them together.
  131. Thank you very much around in these numbers.
  132. Let's see how you did.
  133. So the first number is 783.
  134. 783. Rounded to the nearest 10 is 780.
  135. The next number is 4757.
  136. Rounded to the nearest 10 is 4760.
  137. On the last number is 23,456.
  138. Rounded to the nearest 10 is 23,000, 460.
  139. Did you get them?
  140. All right, don't worry.
  141. If you didn't, we're gonna practice a little bit more
  142. now. Now we're going to have a look at rounding
  143. numbers to the nearest 100.
  144. It works the same.
  145. A surrounding numbers to the nearest 10.
  146. First, we need to underline the digit this time because
  147. we're rounding to the nearest 100.
  148. We will underline the digits in the hundreds place which
  149. is the digit six.
  150. Then we look at the digit next door, which is
  151. the digits seven in the tens.
  152. Place seven is more than five.
  153. So we round up all digits behind the 100.
  154. Place turned to zero.
  155. So 4679 and now it's your turn again.
  156. So look at the digits.
  157. I would like you to round thes numbers to the
  158. nearest 100.
  159. Don't forget to look at the digits in the hundreds
  160. column. Look at the number next door around it, Up
  161. or down, depending on the room.
  162. When you have completed those, we will come back and
  163. mark them.
  164. Please pause the video now.
  165. Thank you very much, Randy.
  166. Good numbers.
  167. Let's see how you did.
  168. The first number is 791.
  169. Rounded to the nearest 100 is 800.
  170. The next number, 9752 to the nearest 100 is 9800.
  171. On the last number, 26,416.
  172. The nearest 100 is 26,400.
  173. Did you get the more right this time?
  174. I'm hoping you did.
  175. Now we're going to round to the nearest 1000 so
  176. it's the same process again.
  177. But this time we're looking at the digits in the
  178. thousands collar.
  179. So here's our number 4679.
  180. First, we need to underline the digit in the thousands
  181. college. That is the digit for.
  182. Then we look at the digit next door, which is
  183. a 66 is higher than five, so we need to
  184. round up.
  185. All of the following digits turned to a zero, so
  186. 4679 rounded to the nearest 1000 is 5000.
  187. Now it's your turn again.
  188. So please round these numbers to the nearest 1000.
  189. Pause your video now and we will answer the answers
  190. altogether. Let's see how we did so.
  191. The first number is 6246 to the nearest 1000 is
  192. 6000 12,378 to the nearest 1000 is 12,000.
  193. On day, 123,987 to the nearest 1000 is 124,000.
  194. I'm hoping this time that everybody got them all right.
  195. Now let's take a now.
  196. Let's take a look at the work that you'll be
  197. doing today.
  198. So here is your homework page.
  199. Questions 1 to 4 ask you to round to the
  200. nearest 10.
  201. If you would like to underline the digit in the
  202. tens place to help you round, then you can.
  203. You should get at least three out of four questions.
  204. 5 to 8.
  205. Ask you to round to the nearest 100 again.
  206. If you want to underline the digits in the hundreds
  207. place to help you, you can.
  208. 9 to 14.
  209. They ask you to run to the nearest 1000 again.
  210. If you want to underline the digit in the thousands
  211. place to help you, then you can.
  212. I would like you to score five out of six.
  213. Last of all is questioned.
  214. 15 on 17.
  215. You need to use the rounded numbers to solve the
  216. problems. If you want to show me which numbers you've
  217. used to solve the problems, I would like you to
  218. do that on the paper.
  219. I also want you to explain why Malik does or
  220. doesn't have enough on why Lee's tuck can or cannot
  221. tow both items.
  222. A Question 17.
  223. You need to explain whether you rounded to the nearest
  224. 1000 or 1000 on Dhe.
  225. Why? These questions are worth what three points would be
  226. great if you could get seven out of nine.
  227. Thank you very much for listening today, and I will
  228. see you tomorrow.