SSC MTS Formula Sheet
Ten formulas, what each one is for, and a worked example.
SSC MTS maths is at about class 10 level, in the Numerical and Mathematical Ability section. It sticks to basic arithmetic and simple mensuration, so a short list of formulas covers almost everything.
Here are the ten that matter, with a worked average example.
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The 10 Formulas
1
Formula
BODMAS order
Expression
Brackets → Of → Division → Multiplication → Addition → Subtraction
Use it for
Simplification questions.
2
Formula
HCF × LCM
Expression
HCF × LCM = Product of the two numbers
Use it for
Finding a missing number from its HCF and LCM.
3
Formula
Percentage change
Expression
(New − Old) ÷ Old × 100
Use it for
Growth and fall in values, and the base of most DI questions.
4
Formula
Profit %
Expression
(SP − CP) ÷ CP × 100
Use it for
Profit or loss on cost price.
5
Formula
Simple interest
Expression
SI = P × R × T ÷ 100
Use it for
Interest that isn't added back to the principal.
6
Formula
Average
Expression
Sum of observations ÷ Number of observations
Use it for
Averages, and finding a missing or replaced value.
7
Formula
Dividing in a ratio
Expression
Share of A = Total × a ÷ (a + b)
Use it for
Splitting an amount, profit or quantity in a ratio.
8
Formula
Time and work (two people)
Expression
Days together = (a × b) ÷ (a + b)
Use it for
When A alone takes a days and B alone takes b days.
9
Formula
Speed, distance, time
Expression
Distance = Speed × Time; km/h × 5/18 = m/s
Use it for
Trains, journeys and unit conversions.
10
Formula
Rectangle and square
Expression
Rectangle: area = l × b, perimeter = 2(l + b); Square: area = a²
Use it for
Area and perimeter questions.
| # | Formula | Expression | Use it for |
|---|---|---|---|
| 1 | BODMAS order | Brackets → Of → Division → Multiplication → Addition → Subtraction | Simplification questions. |
| 2 | HCF × LCM | HCF × LCM = Product of the two numbers | Finding a missing number from its HCF and LCM. |
| 3 | Percentage change | (New − Old) ÷ Old × 100 | Growth and fall in values, and the base of most DI questions. |
| 4 | Profit % | (SP − CP) ÷ CP × 100 | Profit or loss on cost price. |
| 5 | Simple interest | SI = P × R × T ÷ 100 | Interest that isn't added back to the principal. |
| 6 | Average | Sum of observations ÷ Number of observations | Averages, and finding a missing or replaced value. |
| 7 | Dividing in a ratio | Share of A = Total × a ÷ (a + b) | Splitting an amount, profit or quantity in a ratio. |
| 8 | Time and work (two people) | Days together = (a × b) ÷ (a + b) | When A alone takes a days and B alone takes b days. |
| 9 | Speed, distance, time | Distance = Speed × Time; km/h × 5/18 = m/s | Trains, journeys and unit conversions. |
| 10 | Rectangle and square | Rectangle: area = l × b, perimeter = 2(l + b); Square: area = a² | Area and perimeter questions. |
Worked Example: Finding a Removed Number
The average of 5 numbers is 24. When one number is removed, the average of the remaining 4 is 22. What was removed?
- 1
Total of 5
5 × 24 = 120.
- 2
Total of 4
4 × 22 = 88.
- 3
Removed number
120 − 88 = 32.
Questions from this exact syllabus. No signup.
Work With Totals, Not Averages
Average questions become simple once you turn every average into a total (average × count). Add and subtract totals, then divide at the end.
FAQs
Is SSC MTS maths difficult?expand_more
No. It's around class 10 level, and accuracy matters more than advanced techniques.
Is there negative marking on maths?expand_more
SSC MTS Session 1 has no negative marking, and Session 2 does. Check the current notice.
Do I need algebra or trigonometry for MTS?expand_more
Rarely. The section focuses on arithmetic, number system and basic mensuration.
Next steps
Take a full SSC MTS mock testThe whole syllabus in one timed, scored paper.