Thursday 7 September 2017

Group Rua: Subtraction with our story about piranhas

Using the strategy of reversibility.

2 comments:

  1. ashtoncat10:14 am

    i learned making 10-4=6

    ReplyDelete
  2. ashtoncat10:23 am

    i know 10-0=10 and 10-10=0 and 0+10=10 10+0=10 and 10-4=6 and 10-6=4 and 6+4=10
    and 4+6=10 and 10-2=8 and 10-8=2 and 8+2=10 and 10-5=5 and 5+5=10 10-9=1 and 10-1=9 and 9+1=10 and l+9=10

    ReplyDelete