TIME 60 seconds (sec) = 1 minute (min) 60 minutes = 1 hour (hr) 24 hours = 1 day 7 days = 1 week 4 weeks (approx.) = 1 month 365 days = 52 weeks (approx.) = 12 months = 1 year 10 years = 1 decade 100 years = 1 century Length 10 millimeters [...]

1. Integers Integers are whole numbers.. .-4,-3,-2,-1,0, 1,2,3,4,5……. Positive integers are the numbers 1,2,3,4,5…. Zero is neither positive nor negative. Negative integers are the numbers -1,-2,-3,-4,-5,-6,-7 Consecutive integers are writeen as x, x+1, x+2,…. Consecutive even or odd integers are written as x, x+2, x+4, x+6,….. 2. Nonintegers Nonintegers are numbers which have a fractional [...]

1. Multiplying and Dividing Powers To multiply powers with the same base, add the exponents and keep the same base: 3                 4          3+4               7 b     X     b =    b         =   b To divide powers with the same base, subtract the exponents and keep the same base: 12          8             12-8               4 b   /     b   =     b        [...]

Cardinal numbers 379 = three hundred and seventy nine 2,860 = two thousand eight hundred and sixty 5,084 = five thousand and eighty-four 470,000 = four hundred and seventy thousand 2,550,000 = two million, five hundred and fifty thousand 3,000,000,000 = three billion Note: There is no plural’s’ after hundred, thousand, million and billion when [...]

1. Average or Arithmetic Mean To find the average of a set of numbers, add them up and divide by the number of numbers. Sum of the terms Average                        =         Number of terms To find the average of the five numbers 12, 15, 23, 40, and 40, first add them: 12 + 15 + 23 [...]

Length 12 inches (in.) = 1 foot (ft) 36 in. = 3 ft= 1 yard (yd) 5280 ft = 1760 yd = 1 mile (mi) Area 144 square inches (in.2) = 1 square foot (ft2) 9 ft2 = 1 square yard (yd2)= 43,560 ft2 4840 yd2 = 1 acre (A) Volume 1728 cubic inches (in.3) [...]

1. Percent Formula Part = Percent X Whole Example: What is 32% of 25?                            Setup: Part = .32  X  25 Example: 15 is 12% of what number?                  Setup: 15 = .12  X  Whole Example: 25 is what percent of 7?                      Setup: 25 = Percent  X   7 2. Percent Increase and Decrease To increase [...]

1. Setting up a Ratio To find a ratio, put the number associated with the word of in the nominator and the quantity associated with the word to in the denominator. Then reduce.   The ratio of  15 cakes to 12 candys is 15/12,  which reduces to 5/4. 2. Part-to-Part Ratios and Part-to-Whole Ratios If the [...]