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Numerical skills for accounting (Powers & roots (X by itself for…
Numerical skills for accounting
BODMAS
B = Brackets, O = order = power, D = division, m = x, A = +, S = -
Fraction answer, shift=
Memory function
M, memory for B292
Shift RCL M+ or RCL or STO
Msq = ALP M+x2 =
Rounding
Below 5 round down
Above 5 round up
3.3333 = 3.33, 17.346 = 17.35, 21.345 = 21.35, 368.24567 = 368.25, 2 d.p
Significant figures s.f ignores 0 after d.p
Fractions
Part of something & whole
Divide top numerator with bottom denominator for d.p
Good example p18
Ratios
Divided up
Example tips £64 5:8:3 =16, 64/16= 4 then x ratios
Percentages
Rate of 100, 30% 30 out of 100
14/20 x 100 = 70
Example 70% = 70/100 or 0.7, 10% = 10/100 or 0.1
9/10 = 0.9 x 100 = 90%, 2/4 = 0.5 x 100 = 50%
20% profit £45000 includes x 100/120=37500
5% on dividend £150000 x 5% = 7500
Negative numbers
Number small than 0
add is same -, - is same +
x - gives -, + / - gives -
x - gives +, - / - gives +
Reasonableness
Weather the answers looks right or wrong key
Examples p. 26
Powers & roots
X by itself for number equired
x2 = sq, x3 = cub xn = number of times
Sq roots opposite of power 3 sq power 9
Cube root x by itself twice = original number
Add powers x5 x x6 = x11
subtract powers x5 / x3 = x5-3 = x2
Raising power : multiply indices (x2)3 = (3 x 3) x 3
or (x2)3 = x2x3 = x6
power 1 = that number, 0 is 1, 1 power is 1
power can be fraction = sq root
Equations
Different numerical values = variable
a, b, c, x, y, z, must do the same with both sides
4x + 7 = 19, -7 = 4x = 12, / 4 x = 3
Examples on p. 30
Still need work
Sim equations
Not possible to find x, y
Examples p. 32