bri aptitude test

decimal addition rules

1. line up the decimals

2. fill in the empty spots with zero (not necessary, just helps with visualization)

3. add

4. bring down the decimal in answer

decimal subtraction rules

1. line up the decimals

2. fill in the empty spots with zero (not necessary, just helps with visualization)

3. subtract

4. bring down the decimal in answer

decimal multiplication rules

1. the number with the most digits goes on top

2. decimals do not have to line up

3. multiply like normal

4. count how many places in first number the decimal is moved over

5. count how many places in second number the decimal is moved over

6. this is how many places you move the decimal in your answer

decimal division rules

1. divisor can not have a decimal

2. move the divisor decimal so it is a whole number

3. move the same amount of places in dividend

4. place a decimal straight up where you write your answer, rewrite problem

5. divide like normal

fraction rules: adding fractions with common denominators

A/B + C/B = (A+C)/B

fraction rules: subtracting fractions with common denominators

A/B - C/B = (A-C)/B

fraction rules: adding fractions with different denominators

A/B + C/D = AD/BD + CB/DB = (AD+BC)/BD

fraction rules: subtracting fractions with different denominators

A/B - C/D = AD/BD - CB/DB = (AD - BC)/BD

fraction rules: multiplying fractions

A/B X C/D = AC/BD

fraction rules: dividing fractions

(A/B) / (C/D) = A/B X D/C = AD/BC

name some core laws of physics

• Newton’s laws of motion

• laws of mechanics

• electromagnetism

• laws of quantum mechanics

• laws of solid state physics

• laws of nuclear physics

what is the first law of Newton’s laws of motion

an object will not change its motion unless a force acts on it

what is the second law of Newton’s laws of motion

the force on an object is equal to its mass times its acceleration

what is the third law of Newton’s laws of motion

when two objects interact, they apply forces to each other of equal magnitude and opposite direction

how to convert fractions to percentages

multiply the top and bottom of the original fraction by a number that will make the answer’s denominator 100

20,19,17,14,10, __

5

how to evaluate the percent increase of something

original value = (new value) / (1+increase)

how to evaluate the percent change of something

100 X ((new value - original value) / original value)

% increase problem:

convert 12/25 to a percentage

48/100 = 48%