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Whether you’re buying gifts for under the tree or just taking advantage of holiday sales, December is one of those times when you might need some mental math skills.  And while it can seem overwhelming to find out how much that 15%-off cashmere sweater will actually cost you, there are some easy ways to make quick work of these calculations and move on to the next item on your to-do list.  (We’ll look at those on Friday.)

But first you need to answer one big question: Is an estimate good enough?

What’s the total cost?

Let’s say you’re picking up a few things for your Aunt Millie. She has given you a $20 bill and a list.  You absolutely cannot exceed $20, and Aunt Millie is adamant that you get as much as you can for that amount.  In this case, you may want to calculate everything down to the penny.

Or what if you’re purchasing holiday gifts for a family in need.  You’ve set your budget — and you’re not going over it!  Once you have everything in your cart, it could be reassuring to spend a moment or two finding the exact cost of your purchases.

(Here’s a cool hint, though.  If you’re shopping online, these calculations are done for you.  Just put what you want in your online shopping cart, and the totals will be appear — including shipping!)

Can you afford it?

But I would guess that most of us merely need to know if we can afford a purchase — or if what we’re interested in buying is too expensive.  And that’s where estimation comes in handy.

Chandra’s family is HUGE.  And after years of buying a Christmas gift for each of her nine siblings and their spouses and partners, she initiated the good old Secret Santa exchange.  What a relief!

The process is simple. Over pumpkin pie after Thanksgiving dinner, Chandra’s mother brings out her best Sunday hat, which contains slips of paper — one for each of the 18 kids and their partners.  Each person selects a name and buys a present for that person.  The catch? No one can spend more than $50.

This year, Chandra is over the moon.  She drew her sister-in-law’s name, and she knows exactly what to get her — a handmade purse from the local craft fair.

A week later, struggling through the crowd of candle-buying, carol-humming shoppers, Chandra finds exactly what she’s looking for: a cute little bag made of repurposed, 1940s dish towels.  What a find!

She snatches up the bag, and pays $40 for it.  But she’s got $10 left over.  Should she find something to put inside?

Chandra starts looking for a little something more: there’s a handmade key fob for $2.50 or a little zipper pouch for $10. She starts feeling like Goldilocks — the pouch is too much and the key fob is not enough.  She leaves knowing she can make up the difference while shopping elsewhere.

And she hits jackpot later that week.  While picking up a few things at her local, independent bookstore, she spies a sweet little journal at the checkout line that would just fit into the purse.  On sale for $6.50, she figures she has enough to pick up a rollerball pen to go with it.

Just right.  (And notice — very little math!)

Is estimation mandatory?

So let’s say you are really into knowing your costs down to the penny.  What if just having a general idea of what something costs is way too unnerving for you?

Pull out that calculator, sister or brother.  There’s nothing wrong with finding the exact answer, if that’s what you need or want to do.  Just do the rest of us shoppers a couple of favors — move to the side of the aisle while you do your computin’ and while you’re at it, don’t look down your nose at other’s estimations.

Are you an estimator or an exacting kind of person? If you estimate, how? If you like an exact answer, what tools do you use?  Share your stories in the comments section.

On the whole, I don’t like shopping.  But I do like shopping for Christmas gifts. Still, at around this time of year, I’m about ready to hand over my list to someone else — say a personal shopper?  And if she can help me find that perfect outfit for Saturday night’s holiday party?  Even better.

Meet Elana Pruitt, a personal shopper in the L.A. area of California.  Elana isn’t just a shopper.  She helps her clients figure out what they need and how to find it. She also writes about fashion at her blog, Good Girl Gone Shopping. Here’s how she uses math in her job.

Can you explain what you do for a living?  

I am a personal shopper and wardrobe consultant. My day-to-day schedule is never the same because the services I carry out are based on the every individual’s needs. I am committed to helping men and women find quality fashion not just for affordable cost, but at their specific budget. My job entails a variety of duties for my clients: re-organizing closets, styling new outfits using the clothes they already own to prove the versatility of their wardrobe, shopping with (or without) the client at particular stores or online, styling new purchases with their existing wardrobe after a shopping trip, and conducting online research.

Although my services are affordable, I realize that hiring a personal shopper and wardrobe consultant is a luxury. So the other half of my job entails writing about fashion. On my blog, Good Girl Gone Shopping, I provide helpful information about shopping and fashion, with references to our culture, entertainment, and the celebrity phenomenon.

When do you use basic math in your job?  

I’ve never been asked this question before – it’s a good one! In thinking about how I incorporate math into my job, I realize that I use it frequently. From counting items in a client’s closet to calculating my gas mileage for a shopping trip to scheduling appointments throughout the month. Everything I do involves the basics of math: addition, subtraction, multiplication, division, and percentages. Most of the time, I don’t consciously think about the fact that math is a natural, necessary, and unavoidable component of my business. The main time when I am aware that I am using math is when there is a transaction of sorts. I charge hourly rates and a commission percentage of purchases, which needs to be clearly defined to the client. In addition, I sell advertising space on my Good Girl Gone Shopping blog. This also needs to be clearly structured for the client to understand (ads can be sold on a 6-month basis or yearly). Those two specific situations are when I am so happy I paid attention in math class throughout college!

Do you use any technology to help with this math?  

I am usually old school – I use a good ol’ pencil and paper most of the time. Then to double check my work, I use the calculator either on my computer or from my phone.

How do you think math helps you do your job better?

For my job, it’s not that it makes it better – it’s just a part of it. Math is that essential to my work as a personal shopper, wardrobe consultant, and fashion blogger.

How comfortable with math do you feel?  

Basic math is second nature to me. Algebraic formulas take more effort. But fortunately, I’m doing something right, because I am able to successfully see my job through, from the consultation with the client to follow-up communication after my service with him or her is complete.  Overall, I feel comfortable with math…basic math.

What kind of math did you take in high school?  

I took Pre-Algebra, Algebra, and Geometry. I do recall struggling with Geometry. I have always respected those who excel in the study of math, because it requires such analytical thinking. I hate to say I wasn’t good at it, but let’s just say I would never choose to enter that field!

Did you have to learn new skills in order to do the math you use in your job? 

The skills I use now are pretty much standard. Students everywhere need to erase this thought from their brain, “I don’t know why I’m taking this class, I won’t need it in the real world when I grow up!” The journey throughout adulthood can be amazing if you are knowledgeable and skilled in a multitude of areas. Never say never!

Have you ever wondered how personal shopping works? Now’s your chance to ask Elana.  Post your question in the comments section!