Maths - Subtraction Calculator

KJ
by Katie Jones26 views·Updated Jan 13, 2021
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  1. Hello. Everyone in math today we are going to carry
  2. on taking away yesterday you were taking away using first,
  3. then on next frames.
  4. We can use Thies again today If you've still got
  5. them spare on.
  6. I'm going to show you an example of some of
  7. the questions using mine.
  8. I've taken the top off, so I don't have the
  9. words on.
  10. I'm hopefully going to display my examples the right way
  11. around today.
  12. Okay, to make it a little bit easier for you,
  13. I've got my counters and things ready to go on.
  14. Dhe my frame now on teams uploaded, you will find
  15. a little activity sheet that looks like this.
  16. There are lots of different cards.
  17. You may choose to just use one card today or
  18. you might have a go at the mall, depending on
  19. how much you would like to try.
  20. So we're going to have a little look at an
  21. example together on I.
  22. I have chosen the card 16 on.
  23. I'll make it a little bit larger on my screen
  24. so that you can see as well I'll do that
  25. now. Okay, Perfect.
  26. So in the circle is the number 16 on that
  27. is the answer I'm aiming for.
  28. So today I've got to find a calculation.
  29. A take away sentence where I get 16 as my
  30. answer. Okay, so there may well be more than one
  31. way of making the answer.
  32. 16 on.
  33. We're going to explore that together.
  34. Now I'm going thio, move my screen down so that
  35. you can see my table and see me working the
  36. answers for this question out.
  37. I'm just going to force the video so I can
  38. move the camera.
  39. Okay? I've chosen to start with my largest amount of
  40. counters, so I've got 20 counters to begin with now.
  41. I need to take away some of these counters to
  42. get my target answer off.
  43. 16. Let me have a go.
  44. I'm going to move one away.
  45. I'm gonna take away one that would leave me with
  46. 19 over here.
  47. Nope. My target today is 16.
  48. If I take away to how many?
  49. Um, I left with 18.
  50. Nope, not 16.
  51. Let me take away another one that would leave me
  52. with 17.
  53. Take away another one.
  54. That leaves me with 16 16 counters in my now
  55. column. I'm just going to move from around so you
  56. can say back number.
  57. Sentence would be perfect.
  58. 20. Take away for equals 16.
  59. Great. I'm going to write that one down.
  60. Okay, let's try another one.
  61. I'm still going to see if I can get 16.
  62. So I'm going to start now over here.
  63. But this time, instead of starting with 20 I'm going
  64. to start with 19 on.
  65. We've used the word before in class.
  66. I wonder if you could say it with May.
  67. The word is systematically.
  68. Can you say that?
  69. Systematically? That means we're working in an order.
  70. I started first of all with 20 but this time
  71. I'm going to start with 19.
  72. Let's get rid of that spare counter.
  73. Okay, so I've got 19 over here.
  74. I still want to get the target 16.
  75. Okay. So 19, I take away one.
  76. No, that would get me 18, 17, 16, 19.
  77. Take away three gets me 16 counters on.
  78. I could move all of the's here.
  79. I'd like that one.
  80. Town 19.
  81. Take away three equals 16.
  82. What number do you think I would start on next
  83. to see if I could get the answer of 16?
  84. I started with 20.
  85. I've done 19.
  86. Where What number of counters would I put in my
  87. first column next?
  88. That's right.
  89. I would I would use 18 counters.
  90. I'm beginning to spot a bit of a pattern.
  91. Those of you that are really good at maths will
  92. find thes patterns really easy to follow on.
  93. Be able to answer and find your target number pretty
  94. quickly once you've spotted the pattern.
  95. Okay. Today, Like I've said, all I need you to
  96. do is have a little go at choosing one off
  97. the focus.
  98. Target numbers.
  99. Okay. There are lots to choose from.
  100. You may do one really quickly, and you might be
  101. able to find all of the different number sentences in
  102. no time at all.
  103. In which case, have another go with another one.
  104. Otherwise, I'd just like to see you on a piece
  105. of paper having ago and seeing if you can find
  106. a take away number sentence that gets you your answer
  107. in the circle again.
  108. Another activity.
  109. Keep practicing.
  110. That taking away on dhe, remember to use anything you
  111. have at home to help you counters Lego chocolate buttons.
  112. Whatever you have got available, move them around, see if
  113. they can help you.
  114. Right. Good luck with today's learning activity.
  115. See you tomorrow.
  116. Bye.