Highlights
- Mental math engages working memory, attention, and processing speed.
- Arithmetic activates brain networks involved in numbers and planning.
- Everyday opportunities make practice easy and practical.
- Simple tricks make mental math faster and more enjoyable.
With calculators on every phone, it's easy to let technology handle all our arithmetic. Splitting a restaurant bill, working out a discount, or adding up a shopping list now takes just a few taps. But in handing over these small calculations, we may be missing out on a simple, free, and surprisingly effective brain workout.
Mental math, doing calculations in your head, engages several important thinking skills at once. This article explores what happens in your brain when you do mental math, what research suggests about its benefits, and easy ways to make it part of your daily routine.
What Happens in Your Brain During Mental Math
Even a simple calculation like 47 plus 38 involves a lot of mental work:
- Working memory: holding the numbers in mind while you work with them
- Attention: focusing on the problem and avoiding distractions
- Number sense: understanding quantities and relationships between numbers
- Retrieval: recalling math facts like multiplication tables
- Planning and strategy: choosing the best way to solve the problem
- Processing speed: working through steps efficiently
Brain imaging studies show that arithmetic activates a network of brain regions, including the parietal lobes, which are important for understanding numbers and quantities, and the prefrontal cortex, which supports working memory and planning. More complex problems engage these areas more intensely.
Potential Benefits of Mental Math
Strengthens Working Memory
Working memory is your brain's mental workspace, essential for following conversations, making decisions, and solving problems. Mental math is a natural working memory exercise because you must hold and manipulate numbers in your head.
Sharpens Focus
It's hard to do mental math while distracted. Regular practice trains concentration.
Improves Processing Speed
With practice, calculations become faster, giving your processing speed a workout.
Builds Number Confidence
Many adults feel anxious about math. Regular practice with everyday sums builds confidence and reduces math anxiety.
Practical Everyday Benefits
Being comfortable with numbers helps you manage money, compare prices, estimate costs, spot billing mistakes, and make informed decisions.
Keeps the Mind Active
As part of a mentally active lifestyle, mental math contributes to the regular mental challenge linked with healthy brain aging.
What Does Research Say?
Research specifically on mental math and long-term brain health is limited, but there are some interesting findings.
In Japan, neuroscientist Ryuta Kawashima studied a program called "learning therapy," which involved older adults doing simple arithmetic and reading aloud for short periods each day. Small studies found improvements in certain thinking skills, particularly those related to the frontal lobes, in older adults, including some with dementia. His work helped inspire the brain training games that became popular worldwide.
More broadly, research shows that people who engage regularly in mentally stimulating activities tend to maintain their thinking skills better as they age. Mental math is an easy, accessible way to add such stimulation.
As with other brain training, the strongest improvements tend to be in the trained skill itself. Mental math won't make you a genius, but it gives your working memory and attention regular exercise.
Easy Ways to Practice Mental Math Every Day
While Shopping
- Keep a running total of items in your basket
- Calculate discounts, such as 30 percent off
- Compare unit prices to find the best deal
- Estimate your change before paying
At Restaurants
- Work out the tip in your head
- Split the bill between friends
Around the House
- Double or halve recipe ingredients
- Calculate cooking times
- Work out how many days until an event
While Traveling
- Estimate arrival times based on speed and distance
- Convert currencies
- Calculate time zone differences
For Fun
- Add up the digits on license plates
- Count backward from 100 by sevens
- Calculate how many minutes you've been alive
- Play number games with friends or family
Mental Math Tricks to Try
Rounding and Adjusting
To add 49 plus 36, round 49 to 50, add 36 to get 86, then subtract 1 to get 85.
Breaking Numbers Apart
To multiply 7 times 14, think 7 times 10 is 70, plus 7 times 4 is 28, giving 98.
Doubling and Halving
To multiply 16 times 25, halve 16 to 8 and double 25 to 50: 8 times 50 is 400.
Calculating Percentages
To find 15 percent, find 10 percent (move the decimal one place), then add half of that. For $60: 10 percent is $6, half of that is $3, so 15 percent is $9.
Multiplying by 11
For two-digit numbers, add the digits and place the result in the middle. For 23 times 11: 2 plus 3 is 5, so the answer is 253.
Number Games and Brain Training
If you enjoy numbers, try:
- Sudoku and KenKen puzzles
- Number-based brain games that test quick arithmetic
- Card games involving counting, such as cribbage
- Math puzzle books
- Timed arithmetic challenges where you try to beat your best score
Brain games that start with simple sums and gradually increase difficulty can make practice fun and help you track progress.
Tips for Getting Started
- Start easy: build confidence with simple calculations
- Estimate first: estimating is a valuable skill and a good starting point
- Check your answers: use a calculator afterward to confirm
- Practice a little every day
- Be patient with yourself: skills come back quickly with practice
Combine With Other Brain-Healthy Habits
Mental math is one tool among many. For a well-rounded approach, combine it with physical exercise, reading, learning new skills, social activities, good sleep, and a healthy diet.
Overcoming Math Anxiety
Many adults carry memories of struggling with math at school, and the anxiety can linger for decades. Research shows that math anxiety itself takes up working memory, making calculations feel even harder. The good news is that low-pressure, everyday practice can gradually reduce that anxiety. Start with estimates rather than exact answers, celebrate small successes, and remember that there's no time limit and no one grading you. Over time, numbers can become a source of confidence and even enjoyment.
Practicing with a friend or family member can make it more fun, too. Challenge each other with quick sums during a walk or while cooking, and you'll be giving both your brains a workout.
Frequently Asked Questions
Is mental math good for your brain?
Yes. It exercises working memory, attention, and processing speed, and contributes to an active mind.
Can mental math prevent dementia?
No single activity prevents dementia, but staying mentally active is linked with healthier brain aging.
How often should I practice mental math?
A few minutes a day, especially during everyday activities, is a great habit.
What if I'm bad at math?
Start with simple sums and estimates. Many adults find their skills and confidence improve quickly with practice.
Is using a calculator bad for the brain?
Not at all, but relying on it for every small sum means missing a free mental workout.
Do math puzzles count?
Yes. Sudoku, KenKen, and number games all give your brain valuable practice.
Key Takeaways
- Mental math engages working memory, attention, and processing speed.
- Arithmetic activates brain networks involved in numbers and planning.
- Everyday opportunities make practice easy and practical.
- Simple tricks make mental math faster and more enjoyable.
- Combine it with exercise, learning, and social activities for best results.
Next time you reach for your phone's calculator, try working it out in your head first. It's a small habit that keeps your brain busy, sharp, and confident with numbers.
This article provides general educational information and is not medical advice. A qualified healthcare professional can help you evaluate choices in relation to your health history, medications, and individual needs.