Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Study Guide for Retake Quiz – Unit 1 Prime/Composite #s (question #s 4-9) A prime number only has 2 factors. factor x factor = product A composite number has 3 or more factors. Hints Any number that has more than 1 digit and is an even # is a composite. Any number ending with a 5 or 0 is composite (5 as a factor). Many odd numbers are prime (still need to see if there are other factors). If a number is in both the ones and tens place that number is composite (11 as a factor). This does not work with the number 11 though. If you add the two digits together and they equal 9 that # is composite (factor of 9). 1 is a special number. It is neither a prime nor composite number since it only has 1 factor. 2 is a prime number since it has only 2 factors. Factors (question 10) Factors are numbers that when multiplied with another number gives a product (answer). Example: The factors of 12 – 1, 2, 3, 4, 6, 12 Multiples (question 11) Multiples are answers (products) of two factors multiplied together. Example: The first 5 multiples of 3 are: 3, 6, 9, 12, 15 X Strategies (question #s 12-14) A strategy (other than a regular algorithm) should be used. The following are examples of X strategies: To find 14 x 5 – Skip counting 14, 28, 42, 56, 70 Repeated addition 14 + 14 + 14 + 14 + 14 = 70 Expanded Form (10 x 5) + (4 x 5) = 50 + 20 = 70 Breaking Apart (14 x 3) + (14 x 2) = 42 + 28 = 70 (7 x 5) + (7 x 5) = 35 + 35 = 70 Creating a square (question 15) A square is when two factors are the same… 8 x 8 , 6 x 6, etc. When given an array the task is to take that array and decide what other array can be added to this expression to create a square. All work needs to be shown. Example: Given the following array, which other array would help create a square (9 x 9)? (3 x 9) + ( x ) Putting what is known in the equation is the first step…(3 x 9). Then another array is needed to create a full square 9 x 9 array. 3 + ? = 9 The solution would be 6. The 2nd step would be to plug in the new array numbers… (3 x 9) + ( 6 x 9 ) 27 + 54 = 81