solution : estimate square of number and then check all number below that number
97 = 10 = check 2, 3, 5, 7,
How to add or subtract fraction?
need common denominator and numerators are added together or subtracted
Multiplying fractions? 4 x 1 x10
5 8 11
numerators times and denominators
cancelling out = if any numerators are can be divided by the same number as a denominator
4 and 8 divide by 4 and 5 and 10 divide by 5
1 x 1x2 / 1 x 2 x 11
Divide fractions? 1 x 4 2 5
all you have to do is flip the second fraction and then multiply
For every 40 games a baseball team plays, it loses 12 games. What is the ratio of the
team’s losses to wins?
red, blue, and green marbles ratio of 5:4:3, and he has a total of 36 marbles. How many blue
40 - 12 = won 28 games = 12:28 = 3:7
5 + 4 + 3 = 12 = 36/12 = 3 times each by 3 to find how many
4 is what percent of 20?
What percent of 2 is 5?
4 = 20x = 400 =20x = 20%
5 = 2x/100 = 2x = 500 = x = 250%
To convert .3875 into a fraction
delete decimal and has four digits after the decimal point, put four
zeros in the denominator following the number 1:
3875/10000 and reduce
percentage increase or decrease
Sam pays $1.65 for a banana that was originally priced at $2.00
Sam pays $2.00for a banana that was originally priced at $1.65
% increase or decrease = # increase or decrease divide by original number
Adding or subtacting?
factions to an exponent 1 to the exponent 3
need to be same base 2x2 + 3x2
add exponents together
dividing subtracting exponents
1x1x1 over 2x2x2
multiple and divide
single number under a radical sign can be split into two numbers whose product is the
average if do not have all numbers
average of class marks is 74. B got 50%; C got 60%; D got 90% and E got ??
average = sum divide by number of terms
74 = 50 + 60+ 90 + x divided by 4
principle x rate x time
median of a group of numbers is the middle term when the numbers are written in either ascending or descending order.
if two numbers are in the middle you take the mean (average) of two numbers
number that occurs most frequently
difference between the largest term and the smallest term