Round to the Nearest Ten
When adding numbers like 38 + 47, round 38 to 40 (add 2), compute 40 + 47 = 87, then subtract 2 to get 85. Rounding reduces mental load dramatically.
Example: 38 + 47: round 38 to 40 → 40 + 47 = 87 → 87 - 2 = 85
Free Resources for Parents
Practical, expert-written guides to help you support your child's abacus and mental math journey at home.
10 Mental Math Tricks for Kids
Practical techniques you can teach at home. These are the building blocks that abacus training makes automatic — start introducing them today.
Split Numbers Apart (Decomposition)
Break large numbers into tens and units before adding. 56 + 37 becomes (50 + 30) + (6 + 7) = 80 + 13 = 93. This mirrors how the abacus works.
Example: 56 + 37 = (50+30) + (6+7) = 80 + 13 = 93
Multiply by 5 Using Halving
Multiplying by 5 is the same as multiplying by 10 and halving the result. Much easier than direct multiplication.
Example: 5 × 18 = (10 × 18) ÷ 2 = 180 ÷ 2 = 90
Subtract by Adding Up
Instead of subtracting 73 - 48, count up from 48 to 73: +2 to 50, +23 to 73 = 25. This counting-up method is more intuitive for most children.
Example: 73 - 48: count 48→50 (+2), 50→73 (+23) = 25
The 9 Times Table Trick
For 9 × any single digit: the tens digit is (digit - 1) and the two digits always add to 9. Never memorise the 9 table the hard way again.
Example: 9 × 7: tens = 7-1 = 6, units = 9-6 = 3 → 63
Double and Halve for Multiplication
You can double one factor and halve the other without changing the product. This turns awkward multiplications into easy ones.
Example: 16 × 25: halve 16→8, double 25→50 → 8 × 50 = 400
Estimate First, Then Refine
Before calculating, estimate the answer. 47 × 6 is roughly 50 × 6 = 300. The real answer (282) is close. Estimation builds number sense and checks for errors.
Example: 47 × 6 ≈ 50 × 6 = 300 (actual: 282 — in the right range)
Squares of Numbers Ending in 5
Take the tens digit, multiply by the next number up, and append 25. This gives instant squares for 15, 25, 35, 45, 55, 65, 75 and beyond.
Example: 35² = 3×4 then append 25 = 1225
The 11 Times Table Pattern
For 11 × single digits, repeat the digit. For teens (11-18), split the digits and insert their sum in the middle.
Example: 11 × 7 = 77 | 11 × 14: 1_4, middle = 1+4 = 5 → 154
Percentage Made Simple
10% of any number is just move the decimal one left. 1% is move it two left. Build percentages from these: 15% = 10% + 5% (half of 10%).
Example: 15% of 80: 10%=8, 5%=4, total = 12
Want your child to master these techniques automatically through structured abacus training?
Read our full guide: 7 Mental Math Tips Every Parent Should Know →How to Choose the Right Abacus
Not all abacuses are created equal. Here is everything you need to know before buying one for your child.
Standard vs Soroban
The Japanese Soroban (1 upper bead, 4 lower beads per rod) is the modern standard for mental math education. Avoid the older Chinese Suanpan style for educational purposes.
✓ Choose a Soroban-style abacus
Number of Rods
A 17-rod abacus covers all numbers up to 99,999,999 — more than sufficient for children. For competitions, 23 rods are sometimes preferred.
✓ 17 rods is ideal for beginners
Bead Material
Plastic beads move smoothly and are durable. Wooden beads feel pleasant but can warp. Avoid metal beads — they are heavy and loud.
✓ Smooth plastic beads are best
Frame Colour Coding
Many educational abacuses use coloured beads to help beginners identify place values. This is helpful for the first 3-4 months but becomes unnecessary over time.
✓ Colour coding is great for young beginners
Size
A standard classroom abacus (approximately 23cm × 8cm) is comfortable for ages 5+. Mini abacuses are too small for young children to manipulate accurately.
✓ Standard classroom size is appropriate
Where to Buy
Look for educational abacuses from reputable brands on Amazon or educational supply stores. Avoid toy-store versions — they often have imprecise bead movement.
✓ Look for educational grade abacuses
Do You Need to Buy an Abacus Before Starting?
No. During your free demo class, we will guide you on exactly what to purchase based on your child's age and level. We recommend waiting until after the first class so you buy exactly the right tool — nothing more, nothing less.
Book Your Free Demo FirstPractice Tips for Parents
How to support your child's abacus learning between classes — the small habits that make the biggest difference.
Consistency Over Duration
15 minutes of daily practice is worth more than 90 minutes once a week. The brain consolidates skills during sleep, so frequent short sessions are ideal.
Create a Dedicated Practice Space
Set up a consistent, distraction-free area for practice. Remove phones, tablets, and other devices. The ritual of going to the same space signals the brain that focus time has begun.
Time the Drills
Use a simple timer for calculation drills. The gentle time pressure maintains alertness and mirrors the focused conditions of class. Track personal bests and celebrate improvement.
Praise Effort, Not Just Results
When your child makes progress — even small progress — acknowledge the hard work that made it happen. "I can see how much concentration you used" is more powerful than "Well done."
Play Calculation Games
Turn everyday activities into mental math opportunities. Ask your child to calculate the change at a shop, estimate the total grocery bill, or solve quick mental challenges during car journeys.
Never Practice When Tired or Upset
Abacus practice requires focused attention. A tired or frustrated child will form poor habits and negative associations. If emotions are running high, reschedule and return when calm.
Review With Your Child
Ask your child to explain what they learned in class. Teaching is the deepest form of learning. Listening to your child explain a technique also helps you understand their progress.
Communicate With the Instructor
Share observations about your child's practice at home with their instructor. Good feedback helps the teacher understand where additional support or challenge is needed.
Continue Learning
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Want Personalised Guidance?
Every child is different. Book a FREE 45-minute demo class and let our expert instructor Nidhi Khariwal assess your child's individual needs and create a personalised learning plan.
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