Suppose there are seven bananas in a bowl. Elana uses three of them to make a smoothie. How many bananas are left in the bowl? To answer the question, we subtract three from seven. When we subtract, we take one number away from another to find the
difference . The notation we use to subtract
from
is
We read
as
seven minus three and the result is
the difference of seven and three .
Subtraction notation
To describe subtraction, we can use symbols and words.
Operation
Notation
Expression
Read as
Result
Subtraction
seven minus three
the difference of
and
Translate from math notation to words:
ⓐⓑ
.
Solution
ⓐ The expression consists of a minus symbol connecting
and
. We read this as
eight minus one or
the difference of eight and one .
ⓑ The expression consists of a minus symbol connecting
and
. We read this as
twenty-six minus fourteen or
the difference of twenty-six and fourteen .
A model can help us visualize the process of subtraction much as it did with addition. Again, we will use
blocks. Remember a block represents
and a rod represents
Let’s start by modeling the subtraction expression we just considered,
We start by modeling the first number, 7.
Now take away the second number, 3. We'll circle 3 blocks to show that we are taking them away.
Count the number of blocks remaining.
There are 4 ones blocks left.
We have shown that
.
Doing the Manipulative Mathematics activity Model Subtraction of Whole Numbers will help you develop a better understanding of subtracting whole numbers.
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