Estimate Sums

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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.

 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

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.