Estimate Differences
Consider the following options:
68 – 32
49 – 25
Let's identify the expression that has a difference nearly about 40.
Find the difference of each expression by rounding the numbers.
Let’s look at first option.
Round the numbers and then subtract.
| 68 | – | 32 | = | ? |
| ↓ | ↓ | |||
| 70 | – | 30 | = | 40 |
The given expression has a difference of about 40.
Now, look at second option.
| 49 | – | 25 | = | ? |
| ↓ | ↓ | |||
| 50 | – | 30 | = | 20 |
The given expression has a difference of about 20.
So, 68 – 32 has a difference nearly to 40.
