Question

rudy has 10 white seashells, 23 pink seashells, and 21 brown seashells. if he divides his seashells equally between 3 friends, how many seashells will each friend get?

Explanation:

Sub - Question 1: Rudy's Seashells

Step1: Calculate total seashells

First, we need to find the total number of seashells Rudy has. He has 10 white, 23 pink, and 21 brown seashells. So we add them together: $10 + 23+21$.
$10+23 = 33$, and $33 + 21=54$.

Step2: Divide by number of friends

Then we divide the total number of seashells by the number of friends (3) to find out how many each friend gets. So we do $54\div3$.
$54\div3 = 18$.

Step1: Use multiplication formula

We can use the multiplication algorithm. $89\times55=(90 - 1)\times55$.
Using the distributive property $a\times(b - c)=a\times b-a\times c$, we have $90\times55-1\times55$.

Step2: Calculate each part

$90\times55 = 4950$ and $1\times55 = 55$.
Then we subtract: $4950-55 = 4895$.

Step1: Identify the digit

To round to the nearest hundredth, we look at the thousandth place. The number is 213.548. The digit in the thousandth place is 8.

Step2: Apply rounding rule

Since 8 > 5, we round up the digit in the hundredth place. The hundredth place digit is 4, so we add 1 to it. So 4 becomes 5.

Answer:

Each friend will get 18 seashells.

Sub - Question 2: $89\times55$