When subtracting any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 4-0=4$

$\displaystyle 3-1=2$

$\displaystyle 1-0=1$

$\displaystyle \frac{\begin{array}[b]{r}134\\ -\ 10\end{array}}{ \ \ \space 124}$

When subtracting any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 9-0=9$

$\displaystyle 2-1=1$

$\displaystyle 6-0=6$

$\displaystyle \frac{\begin{array}[b]{r}629\\ -\ 10\end{array}}{ \ \ \space 619}$

When subtracting any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 1-0=1$

$\displaystyle 4-1=3$

$\displaystyle 7-0=7$

$\displaystyle \frac{\begin{array}[b]{r}741\\ -\ 10\end{array}}{ \ \ \space 731}$

When subtracting any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 2-0=2$

$\displaystyle 1-1=0$

$\displaystyle 8-0=8$

$\displaystyle \frac{\begin{array}[b]{r}812\\ -\ 10\end{array}}{ \ \ \space 802}$

When subtracting any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 2-0=2$

$\displaystyle 3-1=2$

$\displaystyle 4-0=4$

$\displaystyle \frac{\begin{array}[b]{r}432\\ -\ 10\end{array}}{ \ \ \ \space 422}$

When adding any number by $\displaystyle 10$ the only number that will change in your answer is the tens place. 

$\displaystyle 1+0=1$

$\displaystyle 4+1=5$

$\displaystyle 7+0=7$

$\displaystyle \frac{\begin{array}[b]{r}741\\ +\ 10\end{array}}{\ \ \space751}$

When subtracting any number by $\displaystyle 100$ the only number that will change in your answer is the hundreds place. 

$\displaystyle 7-0=7$

$\displaystyle 8-0=8$

$\displaystyle 5-1=4$

$\displaystyle \frac{\begin{array}[b]{r}587\\ -\ 100\end{array}}{ \ \ \ \space 487}$

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left to the tens place, followed by the hundreds place. 

Add the numbers in the ones place:

$\displaystyle 5+4=9$

Add the numbers in the tens place:

$\displaystyle 3+0=3$

Add the numbers in the hundreds place:

$\displaystyle 2+2=4$

Your final answer should be $\displaystyle 439:$

$\displaystyle \frac{\begin{array}[b]{r}235\\ +\ 204\end{array}}{\ \ \ \ 439 }$

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left to the tens place, followed by the hundreds place. 

Add the numbers in the ones place:

$\displaystyle 0+6=6$

Add the numbers in the tens place:

$\displaystyle 3+2=5$

Add the numbers in the hundreds place:

$\displaystyle 3+1=4$

Your final answer should be $\displaystyle 456:$

$\displaystyle \frac{\begin{array}[b]{r}330\\ +\ 126\end{array}}{\ \ \ 456 }$

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left to the tens place, followed by the hundreds place. 

Add the numbers in the ones place:

$\displaystyle 7+0=7$

Add the numbers in the tens place:

$\displaystyle 8+1=9$

Add the numbers in the hundreds place:

$\displaystyle 3+4=7$

Your final answer should be $\displaystyle 797:$

$\displaystyle \frac{\begin{array}[b]{r}387\\ +\ 410\end{array}}{\ \ \ 797}$