without using number Line 1: (135)+(-275), 2: (-198)-(-212), 3: (2018)+(-2020), 4:(1981)-(-1951), 5:(1983)-(-27), 6:(-2020)-(+505)
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1= -140
2= -410
3= -2
4= 3932
5= 2012
6= 1515
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