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Oh clever people.... Subtraction in year 2. What methods do you use to teach....

Discussion in 'Primary' started by whodbeateacher, Apr 28, 2011.

  1. ..... subtraction when bridging in year 2? I have a very able child who loves to partition everything to add / subtract. This is fine for simple stuff (75+22 or 75-22) but he comes unstuck when it involves bridging (75-28).
    I've tried getting him to partition a bit (so 75-20 is 25 then take away 8 to get the answer) but he's really struggling.
    How would you do this? Or shall I just persevere?
     
  2. Oops. That obviously should read "75 - 20 is 55...." !!

    Sorry.

     
  3. slingshotsally

    slingshotsally Star commenter

    3 steps
    75-28

    A. round up 28 to 30
    B. subtract 30 from 75
    C. Add 2

    BPG
     
  4. greta444

    greta444 New commenter

    Use an empty number line. Take away 20, takes you to 55. Take away 8 and you're at 47.
     
  5. Counting up to find the difference.
    28 to 68 = 40
    68 to 75 = 7
    40 + 7 = 47
     
  6. I would introduce the empty number line, this will be useful when they use larger numbers as well and helps to reinforce place value.
     
  7. Lara mfl 05

    Lara mfl 05 Star commenter

    As others have suggested I would use a numberline for counting on & back.
     

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