Estimate Sums
Consider the following options:
48 + 47
12 + 49
74 + 24
28 + 51
Let's identify the expression that has a sum nearly about 80.
Find the sum of each expression by rounding the addends.
Let’s look at first option.
Round the addends to the nearest tens and then add.
| 48 | + | 47 | = | ? |
| ↓ | ↓ | |||
| 50 | + | 50 | = | 100 |
This expression has a sum nearly equal to 100.
Now, look at second option.
| 12 | + | 49 | = | ? |
| ↓ | ↓ | |||
| 10 | + | 50 | = | 60 |
This expression has a sum nearly equal to 60.
Now, look at third option.
| 74 | + | 24 | = | ? |
| ↓ | ↓ | |||
| 70 | + | 20 | = | 90 |
This expression has a sum nearly equal to 90.
Now let’s look at the last option.
| 28 | + | 51 | = | ? |
| ↓ | ↓ | |||
| 30 | + | 50 | = | 80 |
This expression has a sum nearly equal to 80.
So, 28 + 51 has a sum nearly to 80.
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Help
The correct answer is
Remember :
The smallest number is the one that comes first while counting.
Solution :
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21,27,23
21 is the smallest number.