Write 342.  Write 31 just below it, with the 3 under the 4, and the 1 under the 2.  Now subtract straight down, starting on the right side. 

\(\displaystyle \dpi{100} 2-1=1\)

\(\displaystyle \dpi{100} 4-3=1\)

\(\displaystyle \dpi{100} 3-0=3\)

Our answer is 311.

The bottom is the same in both fractions. This means that we can subtract straight across for the top numbers.  The bottom number remains the same.

\(\displaystyle \dpi{100} \frac{8}{9}-\frac{4}{9}= \frac{8-4}{9}=\frac{4}{9}\)

Subtract the ones \(\displaystyle (5-1 = 4)\), then the tens\(\displaystyle (3-2 = 1)\), then the hundres place\(\displaystyle (9-5 = 4)\).  The difference is 414.

\(\displaystyle 935 - 521 = 414\)

\(\displaystyle Line\;up\;the\;numbers\;and\;subtract\;straight\;down.\)

  \(\displaystyle 23\)

\(\displaystyle \underline{-\;7}\)

\(\displaystyle 3-7=not\;positive\rightarrow \;borrow\;a\;1\;from\;the\;2\;in\; \underline{2}3.\)

   \(\displaystyle \fn_cm 1\: ^{1}3\)

\(\displaystyle \fn_cm \underline{-\;\;\;7}\)

    \(\displaystyle 1\, 6\)

\(\displaystyle 13-7=6\)

\(\displaystyle 1-0=1\)

\(\displaystyle Line\;up\;the\;numbers\;and\;subtract\;straight\;down.\)

     \(\displaystyle 87\)

\(\displaystyle \underline{-\;19}\)

\(\displaystyle 7-9=not\;positive\rightarrow \;borrow\;a\;1\;from\;the\; 8\;in\;\underline{8}7.\)

    \(\displaystyle 7\: ^{1}7\)

\(\displaystyle \underline{-\;1\: 9}\)

     \(\displaystyle 6\:8\)

\(\displaystyle 17-9=8\)

\(\displaystyle 7-1=6\)

\(\displaystyle x+35=135\)

    \(\displaystyle \underline{-35\;\;\;-35}\)

\(\displaystyle x=135-35\)

   \(\displaystyle 135\)

\(\displaystyle \underline{-\;35}\)

   \(\displaystyle 100\)

\(\displaystyle x=100\)

\(\displaystyle Lexie=Jenna+3\)

\(\displaystyle 6=Jenna+3\)

\(\displaystyle \fn_cm \underline{-3\;\;\;\;-3}\)

\(\displaystyle 6-3=\;Jenna\)

\(\displaystyle Jenna\;has\;3\;marbles\)

Line up the digits vertically. When subtracting the digits in the ones place, you will need to borrow a ten, so the 8 in the tens place becomes a 7 and the 1 in the ones place becomes 11. Now subtract the digits in the ones place \(\displaystyle (11-6= 5)\). Now subtract the digits in the tens place \(\displaystyle (7-2 =5 )\). The difference is 55.

Subtract; start with nine birds. Three flew away: \(\displaystyle 9-3 = 6\).

Six are left, then two more flew away: \(\displaystyle 6-2 =4\).

Four birds are left on the branch.

To find the difference, you need to subtract. When subtracting, always remember to put the greater number first!

Line the numbers up vertically.

\(\displaystyle \begin{matrix} &531 \\ - & 327 \end{matrix}\)

Subtract each column, starting with the ones place and moving to the left. You will need to cancel in order to subtract the ones.

\(\displaystyle 531-327=204\)

The difference between 327 and 531 is 204.