3 3/4+1 1/2 2 5/6-1 5/12 4 -1 2/3 3 2/7-6/7 1 1/3*4 3 1/4*2/5 2 1/4:3 20:2 1/2

3 3/4+1 1/2
2 5/6-1 5/12
4 -1 2/3
3 2/7-6/7
1 1/3*4
3 1/4*2/5
2 1/4:3
20:2 1/2

  • 3 3/4+1 1/2=3 3/4+1 2/4=4 5/4=
    =5 1/4

    2 5/6-1 5/12=2 10/12-1 5/12=1 5/12

    4-1 2/3=3 3/3-1 2/3=2 1/3

    3 2/7-6/7=2 9/7-6/7=2 3/7

    1 1/34=4/34=16/3=5 1/3

    3 1/42/5=13/42/5=13/10=1 3/10

    2 1/43=9/43=9/41/3=3/4

    202 1/2=205/2=202/5=8

  • 3 3/4 + 1 1/2 = 3 3/4 + 1 2/4 = 4 5/4 = 5 1/4
    2 5/6 — 1 5/12 = 2 10/12 — 1 5/12 = 1 5/12
    4 — 1 2/3 = 3 3/3 — 1 2/3 = 2 1/3
    3 2/7 — 6/7 = 2 9/7 — 6/7 = 2 3/7
    1 1/3 * 4 = 4/3 * 4 = 16/3 = 5 1/3
    3 1/4 * 2/5 = 13/4 * 2/5 = 26/20 = 1 6/20 = 1 3/10
    2 1/4 : 3 = 9/4 : 3 = 9/4 * 1/3 = (3*1)/(4*1) =3/4
    20 : 2 1/2 = 20 : 5/2 = 20 * 2/5 = (4*2)/1 = 8

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