# If Bob had 7 apples and Sally took 3, now many are left?

Jul 20, 2016

$4$

#### Explanation:

Use simple subtraction. Imagine seven apples are in front of you:

o o o o o o o

Then pretend three disappeared.

o o o o $\cancel{\text{o o o}}$

Now count the remaining apples. There are four left over.


Or you could write this out as a math problem:

$7 - 3 = x$

Do the math using a calculator or write it out.

$7 - 3 = 4$

Jul 22, 2016

Another way of calculating the answer. It is really the same as the other methods. It just looks different.

$7 - 3 = 4$

#### Explanation:

Known: $\textcolor{b l u e}{3 + 4 = 7}$

Substitute for 7 giving:

So for $\textcolor{b r o w n}{7 - 3 \textcolor{b l u e}{\text{ "->" } 3 + 4} - 3}$

$\implies 3 - 3 + 4 \text{ "=" "0+4" "=" } 4$