using compatiblie numbers what number is close to 1,826

Question

i need help in compatible numbers.

Answer 1

Compatible numbers are numbers that are close in value to the actual numbers, and which make it easy to perform mental arithmetic.

 

So, when selecting a number close to 1826, you should consider the other number(s) and the operation to be performed.

 

For example,

   Q: How long ago was 1826?

   A; Use 2017 and 1817 as compatible numbers to get "approximately 200 years ago."

 

   Q: Each section of the stadium holds 100 people; how many sections are needed for 1826 people?

   A: 1800 people require 18 sections; the rest fit into the 19^th section.

 

   Q: I bought 3 notebooks for $18.26; how much did each one cost?

   A:  A little over $3.00  (that is, 1800/3 cents);  more precisely, approximately $3.09 (that is, $18.27/3).

 

Note that compatible numbers are chosen to "relate" to each other based on the operation to be performed; they are approximately equal, not simply rounded.

Answer 2

Eujay, we want to round to the nearest 10, 50 or 100, right? Let's look at the options.

 

We could round to 1830, but that's not much easier to work with.

 

Or, 1850. Better, but still not great.

 

The best would be 1800, a nice number that is way easier to use than 1826.

 

For example, 1826 x 52. Whoa! If we round and do 1800 x 50, we can estimate our product to be around 90,000.

 

Hope this helps!