Everyday Market Math
Ditch the phone calculator and shop with total confidence. Learn intuitive mental shortcuts to track cart totals, spot fake deals, calculate discounts, and split bills on the spot.
Like Duolingo, but for Everyday Market Math. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through In the Aisles and At the Checkout. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in Everyday Market Math
- Rounding awkward cents to clean anchors ($0.50 or $1.00) makes mental addition fast without losing much accuracy
- $4.49 rounds naturally to $4.50, and $2.89 rounds up to $3.00
- Adding $4.50 and $3.00 gives $7.50, bringing a $14 running cart total to $21.50
- Rounding up adds a small surplus to your mental sum, while rounding down removes a small amount
- When shopping with a mixed cart, round-ups and round-downs naturally offset each other rather than compounding
- This natural canceling effect allows a quick estimate to land within cents of the actual receipt
- Always rounding up creates an intentional overestimate, ensuring your mental count is higher than the register price
- This built-in safety cushion prevents embarrassing checkout shortages when carrying limited cash
- Nearest-dollar or alternating rounding gives a closer true estimate, but risks leaving your mental tally slightly below the final bill
- Adding items individually forces you to hold a changing sum in memory with every single item you grab
- Group items of identical or similar price together and multiply instead of doing repeated addition
- Adding one combined bundle total to your cart keeps your mental working memory clear
- A 3/4 pound portion is simply one half plus one quarter of a pound
- Finding half of $8.00 is $4.00, and finding a quarter is halving that again to get $2.00
- Adding $4.00 and $2.00 gives the exact cost of $6.00 without long multiplication
- Dividing $6.00 by 5 lbs gives $1.20 per pound for the bagged potatoes
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Everyday Market Math the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
You grab an olive oil for $4.49 and bread for $2.89. What are the easiest nearby anchors to round them to?
Get it right to open this lesson and 10 more in the app.
Where Everyday Market Math takes you
- 1
In the Aisles
- Running Cart Totals with Rounding
- Produce Scales and Unit Pricing
- 2
At the Checkout
- Markdowns, Sales, and Percentages
- Cash Change and Splitting the Bill
2 sections · 4 units · 11 levels. Built to play, not to enroll.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
Everyday Market Math is taught in the Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start Everyday Market Math today.
Download Tomo, search Everyday Market Math, and play your first lesson in under a minute.