h: \(245+\left(-2023\right)+\left(-45\right)+23\)
\(=\left(245-45\right)+\left(-2023+23\right)\)
\(=200-2000=-1800\)
k: \(\left(-1986\right)+2478+986+\left(-1478\right)\)
\(=\left(-1986+986\right)+\left(2478-1478\right)\)
=-1000+1000
=0
m: \(\left(-2024\right)+1976+2024+\left(-976\right)\)
\(=\left(-2024+2024\right)+\left(1976-976\right)\)
=0+1000
=1000
n: \(\left(-415\right)+248+\left(-85\right)+52\)
\(=\left(-415-85\right)+\left(248+52\right)\)
=-500+300
=-200
o: \(\left(-17\right)+\left(-196\right)+296+117\)
\(=\left(296-196\right)+\left(117-17\right)\)
=100+100
=200
p: \(245+\left(-1976\right)+55+976\)
\(=\left(245+55\right)+\left(-1976+976\right)\)
=300-1000
=-700
q: \(\left(-1798\right)+24+798+\left(-1924\right)\)
\(=\left(-1798+798\right)+\left(24-1924\right)\)
=-1000-1900
=-2900
a, 245 + (- 2023) + (- 45) + 23
= 245 - 2023 - 45 + 23
= ( 245 - 45 ) - ( 2023 - 23 )
= 200 - 2000
= -1800
b, (- 1986) + 2478 + 986 + (- 1478)
= - 1986 + 2478 + 986 - 1478
= ( - 1986 + 986) + ( 2478 - 1478)
= - 1000 + 1000
= 0
c, (- 2024) + 1976 + 2024 + (- 976)
= - 2024 + 1976 + 2024 - 976
= ( - 2024 + 2024 ) + ( 1976 -976 )
= 0 + 1000
= 1000
d, ( - 415 ) + 248 + (- 85 ) + 52
= - 415 + 248 - 85 + 52
= ( 248 + 52 ) - ( 415 + 85 )
= 300 - 500
= -200
e, (- 17) + ( - 196) + 296 + 117
= - 17 - 196 + 296 + 117
= ( 296 - 196) + ( 117 - 17)
= 100 + 100
= 200
f, 245 + ( - 1976) + 55 + 976
= 245 - 1976 + 55 + 976
= ( 245 + 55) - ( 1976 - 976)
= 300 -1000
= - 700
g, ( - 1798) + 24 + 798 + ( - 1924)
= - 1798 + 24 + 798 - 1924
= ( - 1798 + 798) - ( 1924 - 24)
= -1000 - 1000
= -2000