PRACTICE: Subtraction

Plot the bigger number on the number line and count to the left by the smaller number.

Plot 35 on the number line.

Jump 24 units to the left from 35. 24 is made up of 2 tens and 4 ones. So we can jump to the left by 2 tens and then 4 ones.

We end up at 11 on the number line. So: 35 - 24 = 11

Use the subtraction algorithm method.

Write the subtraction in a vertical algorithm.\begin{array}{c} &8&5&4 \\ -& & &6 \\ \hline \\ \hline \end{array}

Begin with the ones column. Since we don't have enough ones to subtract, we need to trade 1 ten from the tens column. \begin{array}{c} & 8&4&\text{}^1 4 \\ -&&&6 \\ \hline \\ \hline \end{array}

Subtract the numbers in the ones column: 14-6=8.

\begin{array}{c} & 8&4&\text{}^1 4 \\ -&& &6 \\ \hline \ &&&8 \end{array}

Bring down the tens and hundreds place values.

\begin{array}{c} & 8&4&\text{}^1 4 \\ -&& &6 \\ \hline \ &8&4&8 \end{array}

Use the subtraction algorithm method.

Write the subtraction in a vertical algorithm.\begin{array}{c} & 4 &4 &7 \\ -& &8 &1 \\ \hline & &&\\ \hline \end{array}

Subtract the numbers in the ones column: 7-1=6.\begin{array}{c} & 4 &4 & 7 \\ -& &8 &1 \\ \hline & &&6\\ \hline \end{array}

Next with the tens column, since we don't have enough tens to subtract, we need to trade 1 hundred from the hundreds column.\begin{array}{c} & 3 &\text{}^1 4 & 7 \\ -& &8 &1 \\ \hline & & &6 \\ \hline \end{array}

Then subtract the next place value, 14- 8 = 6, and bring down the hundreds place value.\begin{array}{c} & 3 &\text{}^1 4 & 7 \\ -& &8 &1 \\ \hline &3 &6 &6 \\ \hline \end{array}

So, 447- 81= 366.