The MentalMath blog
A collection of useful articles on mental arithmetic, memory training, brain games and child development. Practical tips for parents and teachers.
Preparing for a Math Olympiad: An 8-Week Plan for Primary School Children
Olympiad problems are nothing like a regular test: they check logic, pattern spotting and creative thinking. Here is how to prepare a child in grades 2-4 in six to eight weeks.
What Is Flash Anzan and Why It Is the Final Stage
Adding numbers that flash on screen for a fraction of a second is flash anzan. How it works, what the mental abacus is, who it suits and how to train it properly.
Big Friends (Pairs of 10): How Crossing the Ten Works
The most-used formula in mental arithmetic: big friends. Pairs 1-9, 2-8, 3-7, 4-6, 5-5, the crossing-the-ten rule and combined formulas, all with worked examples.
Small Friends (Pairs of 5): The First Step on the Abacus
What is the "small friends" formula on the abacus, and why is it the most important first step in mental arithmetic? Pairs 1-4 and 2-3, addition and subtraction rules with clear examples.
The Trachtenberg System: Multiplying by 11, 12, 9 and 6 Without Paper
The Trachtenberg system is a set of rules that lets you multiply without knowing the times tables. Rules for 11, 12, 9 and 6 with worked examples and checks.
Vedic Mathematics: Nikhilam and Urdhva Explained
What is Vedic mathematics and how does it work? Multiplying by base 100 and 1000 (Nikhilam), the vertically-and-crosswise method (Urdhva), and squaring numbers ending in 5.
How to Memorize the Multiplication Table Easily and Fast
Is the multiplication table a struggle for your child? Start with understanding, follow an easy order, use the symmetry secret, finger tricks and games — a practical roadmap for parents.
Fast Calculation Techniques: 7 Ways to Speed Up Mental Math
7 practical techniques that noticeably speed up mental calculation: rounding, the magic of multiplying by 11 and 9, squaring tricks and the Vedic method — with worked examples.
What is Vedic Mathematics? Secrets of Mental Calculation in Seconds
Vedic mathematics is a unique ancient Indian system that increases calculation speed up to 10 times. Teach your child to calculate mentally in seconds!