# Faster Percentage Calculation

## Faster Percentage Calculation

The quickest way to calculate percentages is to multiply numbers first and handle two decimal places later.

For example, 20% of 70 is 20 x 70 = 1400, so the answer is 14.

70% of 20 is also 14.

To calculate the percentage of 72 or 29, then round up and down to the nearest multiple (70 and 30 respectively) to get a quick approx result.

Clock and Time Problems, Tips and Tricks, Formula

These are the different type of questions asked from this topic.

Type 1:  Find the time when the angle between the two hands are given.

Type 2:  Find the angle between the 2 hands when the time is given.

Type 3:  Find the time, when clocks gaining/losing time.

Type 4:  Find the time in the mirror image.

ക്ലോകിലെ ഓരോ അക്കങ്ങൾക്കിടയിലെ കോണളവ്= 30°.
മിനിറ്റ് സൂചി ഓരോ മിനുറ്റിലും 6° ചുറ്റും.
മണിക്കൂർ സൂചി ഒരു മിനുറ്റിൽ ½°ചുറ്റും.
ഒരുദിവസം Hour, Minute സൂചികൾ 22 തവണ ഒന്നിന് മീതെ ഒന്നായി വരും.
ക്ലോകിലെ സൂ...

Important Maths Formulas ( പ്രധാനപ്പെട്ട ഗണിത സൂത്രവാക്യങ്ങൾ )

Important Maths Formulas .

(a ± b) 2 = a 2 ± 2ab + b 2 .

(a + b + c) 2 = a 2 + b 2 + c 2 + 2(ab + bc + ca).

(a + b + c + d) 2 = a 2 + b 2 + c 2 + d 2 + 2(ab + ac + ad + bc + bd + cd) .

Geometry formulas .

Perimeter ( ചുറ്റളവ് ) .

Perimeter of a square: P=4a.

a: length of one side.

Perimeter of a rectangle: P=2(l+w).

l: length.

w: width.

Perimeter of a triangle: P=a+b+c.

a, b, and c: lengths of the 3 sides.

Area ( വിസ്തീര്‍ണ്ണം ) .
LINE_FE...

BODMAS Rule

BODMAS is an acronym and it stands for Bracket, Of, Division, Multiplication, Addition and Subtraction. .

This explains the order of operations to solve an expression. According to Bodmas rule, if an expression contains brackets ((), {}, []) we have to first solve/simplify the bracket followed by of (powers and roots etc.), then division , multiplication , addition and subtraction from left to right. .

Example :.

7 + (6 × 52 + 3) =   7 + (6 × 25 + 3).

7 + (150 + 3).

7 + (153).

7 + 153 .

Ans: 160. .

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