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### 18 Cards in this Set

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 Whole positive and negative numbers are called what? Integers Is 0 an Integer? Yes Describe the number 642 using "digits" 6 hundreds digits 4 tens digits 2 units digits List all even numbers between -5 and 5 -4, -2, 0, 2, 4 Note: 0 is an even number Is the result even or odd if: a. even x even = ? b. odd x odd = ? c. even x odd = ? a. even b. odd c. even Is the resule even of odd if: a. even + even = ? b. odd + odd = ? c. even + odd = ? a. even b. even c. odd an integer than can only be divided by itself and and 1 without any remainder is called what? List examples... Prime Examples: 2, 3, 5, 7, 11, 13 How can you quickly tell if a number is evenly divisible by 2? Check to see if the sum of the digits is divisible by 2. If so, then the number is divisible by 2. Note: the same is true of 3's. If the sum of digits is evenly divisible by 3 then the number is divisible by 3. How can you quickly tell if a number is evenly divisible by 4? If the number formed by the last two digits is evenly divisible by 4 then the whole number is divisible by 4. How can you quickly tell if a number is evenly divisible by 6? It must be evenly divisible by BOTH 2 and 3. 5/7 + 3/7 = ? 8/7 Note: If the denominator is the same you just add the numberators and put them over the same denominator. 1/2 + 2/3 = ? 7/6 Note: When adding or subtracking fractions with different denominators you must change them to common denominators. In this case 1/2 = 3/6 and 2/3 = 4/6. 3/6 + 4/6 = 7/6 What is the rule for multiplying fractions? multiply the two numerators to get the solution's numberator & multiple the two denominators to get the solution's denominator. 2/3 x 6/5 = ? 12/15 OR 4/5 (reduced) What is the rule for dividing fractions? Invert one number and then multiply. 2/3 divided by 3/4 = ? 8/9 Found by inverting 3/4. 2/3 x 4/3 = 2 x 4 / 3 x 3 = 8/9 If 2 boxes hold a total of 14 shirts, how many shirts are contained in 3 boxes? 21 This is a proportion test. Setup a proportion equation and solve for x. The proportion equation here is: 2/14 = 3/x. Solve for x. Cross multiply the equation to determine 2x = 42. x therefore is 21. How do you solve for x in the following equation? 2/14 = 3/x Cross multiply and solve for x. X = 21 in this case.