Friday, January 11, 2013

How We're All Learning Division in Fourth Grade

     I borrowed this from an Everyday Mathematics site I found on the web, and the numbers are larger than what we're working with, but parents, I think this will give you a good idea of how we are learning to do long division!


Division

For division, Everyday Mathematics offers two methods: the "partial quotients method" and the "column division method". The traditional method of long division is not taught.

Partial Quotients Method

The Partial Quotients Method, the Everyday Mathematics focus algorithm for division, might be described as successive approximation. It is suggested that a pupil will find it helpful to prepare first a table of some easy multiples of the divisor; say twice and five times the divisor. Then we work up towards the answer from below. In the example at right, 1220 divided by 16, we may have made a note first that 2*16=32 and 5*16=80. Then we work up towards 1220. 50*16=800 subtract from 1220, leaves 420; 20*16=320; etc..
------  |
  16 ) 1220  |
      - 800  |  50
       ----  |
        420  |
      - 320  |  20
        ---  |
        100  |
      -  80  |   5
        ---  |
         20  |
      -  16  |   1
         --  |  --
          4  |  76

  ans: 76 R4     

1 comment:

  1. My dad and I watched the video. He said you use what you know to figure out what you don't know.

    ReplyDelete

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