We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 39-23=16\)

\(\displaystyle 39-22=17\)

\(\displaystyle {\color{Teal} 39-19=20}\)

\(\displaystyle 39-20=19\)

\(\displaystyle 39-21=18\)

Because we are looking for the number that when subtracted from \(\displaystyle 39\) equals \(\displaystyle 20\), our correct answer is \(\displaystyle 19\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 27-22=5\)

\(\displaystyle 27-21=6\)

\(\displaystyle {\color{Teal} 27-20=7}\)

\(\displaystyle 27-23=4\)

\(\displaystyle 27-24=3\)

Because we are looking for the number that when subtracted from \(\displaystyle 27\) equals \(\displaystyle 7\), our correct answer is \(\displaystyle 20\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 45-9=36\)

\(\displaystyle 45-10=35\)

\(\displaystyle 45-11=34\)

\(\displaystyle {\color{Teal} 45-12=33}\)

\(\displaystyle 45-13=32\)

Because we are looking for the number that when subtracted from \(\displaystyle 45\) equals \(\displaystyle 33\), our correct answer is \(\displaystyle 12\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 83-59=24\)

\(\displaystyle 83-58=25\)

\(\displaystyle 83-57=26\)

\(\displaystyle {\color{Teal} 83-56=27}\)

\(\displaystyle 83-55=28\)

Because we are looking for the number that when subtracted from \(\displaystyle 83\) equals \(\displaystyle 27\), our correct answer is \(\displaystyle 56\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 65-39=26\)

\(\displaystyle 65-34=31\)

\(\displaystyle 65-36=29\)

\(\displaystyle {\color{Teal} 65-37=28}\)

\(\displaystyle 65-38=27\)

Because we are looking for the number that when subtracted from \(\displaystyle 65\) equals \(\displaystyle 28\), our correct answer is \(\displaystyle 37\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 85-30=55\)

\(\displaystyle 85-31=54\)

\(\displaystyle 85-32=53\)

\(\displaystyle {\color{Teal} 85-29=56}\)

\(\displaystyle 85-28=57\)

Because we are looking for the number that when subtracted from \(\displaystyle 85\) equals \(\displaystyle 56\), our correct answer is \(\displaystyle 29\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 89-22=67\)

\(\displaystyle 89-23=66\)

\(\displaystyle 89-24=65\)

\(\displaystyle {\color{Teal} 89-25=64}\)

\(\displaystyle 89-26=63\)

Because we are looking for the number that when subtracted from \(\displaystyle 89\) equals \(\displaystyle 64\), our correct answer is \(\displaystyle 25\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 79-2=77\)

\(\displaystyle 79-6=73\)

\(\displaystyle 79-5=74\)

\(\displaystyle {\color{Teal} 79-4=75}\)

\(\displaystyle 79-3=76\)

Because we are looking for the number that when subtracted from \(\displaystyle 79\) equals \(\displaystyle 75\), our correct answer is \(\displaystyle 4\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 82-61=21\)

\(\displaystyle 82-60=22\)

\(\displaystyle 82-62=20\)

\(\displaystyle {\color{Teal} 82-63=19}\)

\(\displaystyle 82-64=18\)

Because we are looking for the number that when subtracted from \(\displaystyle 82\) equals \(\displaystyle 19\), our correct answer is \(\displaystyle 63\)

We can use substitution to determine the value of \(\displaystyle x\). 

\(\displaystyle 94-41=53\)

\(\displaystyle 94-42=52\)

\(\displaystyle 94-40=54\)

\(\displaystyle {\color{Teal} 94-39=55}\)

\(\displaystyle 94-38=56\)

Because we are looking for the number that when subtracted from \(\displaystyle 94\) equals \(\displaystyle 55\), our correct answer is \(\displaystyle 39\)