Question

1) 28 -(+47)=
-37x (-21)
-128 / (-16)=
1/7 +(2/3)=

Answer 1

1) 28-(+47) = 28 -47 = -19
2) -37x(-21) = +777
3) -128/(-16) = +8
4) 1/7 + 2/3 = 3/21 + 14/21 = 17/21

Answer 2

28 - (+ 47) = 28 - 47 = - 19

  4 7
- 2 8
  1 9
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b)
- 37 x ( - 21)  = + 777

   3 7
x 2 1
   3 7
7 4 +
7 7 7
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c)
- 128 / - 16 = + 8

128  =  8
  16
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d)
1 + 2  =   3 + 14  = 17
7    3          21        21