{"id":1489,"date":"2012-04-04T15:19:48","date_gmt":"2012-04-04T22:19:48","guid":{"rendered":"https:\/\/magoosh.com\/gmat\/?p=1489"},"modified":"2020-01-15T10:50:48","modified_gmt":"2020-01-15T18:50:48","slug":"integer-properties-the-most-common-gmat-question-topic","status":"publish","type":"post","link":"https:\/\/magoosh.com\/gmat\/integer-properties-the-most-common-gmat-question-topic\/","title":{"rendered":"Integer Properties: The Most Common GMAT Question Topic"},"content":{"rendered":"<p><strong>Fact<\/strong>: one of the <a href=\"https:\/\/magoosh.com\/gmat\/what-kind-of-math-is-on-the-gmat-breakdown-of-quant-concepts-by-frequency\/\">most tested categories of concepts on the GMAT Quantitative section<\/a>\u00a0is Integer Properties<\/p>\n<p>&nbsp;<\/p>\n<h2>What are the &#8220;properties of integers&#8221;?<\/h2>\n<p>Probably none of these are brand new to you &#8212;- in fact, you probably learned about all these in grade school.\u00a0 Here&#8217;s a list.<\/p>\n<p>a) factors and multiples; GCF and LCM<\/p>\n<p>b) quotient and remainder<\/p>\n<p>c) even &amp; odd<\/p>\n<p>d) prime numbers<\/p>\n<p>e) consecutive numbers and other consecutive sets (odds, evens, multiple of 5, etc.)<\/p>\n<p>f) special properties of 1 (e.g. 1*(any number) = that number)<\/p>\n<p>g) special properties of 0 (e.g. (any number) + 0 = that number, (any number)*0 = 0)<\/p>\n<p>&nbsp;<\/p>\n<p>Again, nothing here is anything that is not covered in grade school, but the trick is: you have to have this all at your fingertips when you take the GMAT.\u00a0 These interrelated concepts lend themselves effortlessly to a myriad of PS &amp; DS questions, and you need to handle them deftly with precision.\u00a0 See this post <a href=\"https:\/\/magoosh.com\/gmat\/gmat-math-factors\/\">https:\/\/magoosh.com\/gmat\/math\/arithmetic\/gmat-math-factors\/<\/a>\u00a0for tips about factors, multiples, GCF, and LCM. \u00a0For more tips, see below.<\/p>\n<p>&nbsp;<\/p>\n<h2>What are integers?<\/h2>\n<p>Integers are positive and negative whole numbers.\u00a0 They are the set:<\/p>\n<p align=\"center\">{ . . . -3, -2, -1, 0, 1, 2, 3, . . .}<\/p>\n<p>They go on forever in the positive and negative direction.\u00a0 They do not include fractions, decimals, and numbers like pi. One way for non-mathy folks to remember the integers: the word &#8220;integer&#8221; shares a root with the word &#8220;integrity&#8221; &#8212; both come from the Latin word for &#8220;whole, wholeness.&#8221;\u00a0 If I have integrity, there is a wholeness among my intention, my speech, and my actions; people who lack integrity say one thing and do another.<\/p>\n<p>Big GMAT idea: \u00a0if the GMAT makes a numerical statement (e.g. x &lt; 3), do not assume x is an integer unless that is specified.\u00a0 That&#8217;s one of the biggest DS traps, assuming the only possibilities are integers when there are many more possibilities allowed.\u00a0 Here&#8217;s a trippy advanced math idea: the infinity of non-integers is infinitely bigger than the infinity of integers.\u00a0 (Read <a href=\"http:\/\/en.wikipedia.org\/wiki\/Infinity\">http:\/\/en.wikipedia.org\/wiki\/Infinity<\/a> if you are up for an adventure learning about infinity &#8212; well beyond what you need to know for the GMAT).<\/p>\n<h2>Even and Odd<\/h2>\n<p>First of all, here are three addition rules:<\/p>\n<p>1) (even) + (even) = (even)<\/p>\n<p>2) (odd) + (odd) = (even)<\/p>\n<p>3) (even) + (odd) = (odd)<\/p>\n<p>Those also work if the addition sign is changed to a subtraction sign.<\/p>\n<p>Now, three multiplication rules<\/p>\n<p>1) (even)*(even) = (even)<\/p>\n<p>2) (odd)*(odd) = (odd)<\/p>\n<p>3) (even)*(odd) = (even)<\/p>\n<p>(These rules are <strong><em>not<\/em><\/strong> the same if the multiplication sign is changed to division!) If you have trouble remembering these six rules, you can always use even = 2 and odd = 3 to remind yourself.\u00a0 (Yes, 1 is also odd, but I recommend not using that as a test number only because it has so many special properties.)<\/p>\n<p>Keep in mind: zero is an even number.\u00a0\u00a0 Keep in mind, also: negative numbers can be even and odd, just like their positive compatriots.\u00a0 Fractions and non-integers cannot be even or odd: it&#8217;s exclusively an integer property.<\/p>\n<p>&nbsp;<\/p>\n<h2>Prime<\/h2>\n<p>Every number has 1 as a factor.\u00a0 Every number has itself as a factor.\u00a0 A number is prime if it has only those two factors, i.e., no factors other than 1 and itself.\u00a0 Only positive integers are said to be prime; we do not apply the distinction &#8220;prime&#8221; or &#8220;not prime&#8221; to negative integers, zero, or to non-integers.<\/p>\n<p>Here is a list of the first few primes:<\/p>\n<p align=\"center\">2, 3, 5, 7, 11, 13, 17, 19, 23, 29, . . .<\/p>\n<p>The primes go on forever in an irregular pattern, the nature of which involves the hardest unanswered question in math today, the Riemann Hypothesis &#8212; again, well beyond what you need to know for the GMAT.\u00a0 It would be good to memorize that list of the first ten prime numbers: that will help you a lot on the GMAT.\u00a0 Notice that, for a variety of reasons with which we need not concern ourselves here, 1 is not a prime number.\u00a0 Notice, also: 2 is the only even prime number: all other even numbers are divisible by 2.\u00a0 That&#8217;s a very handy distinction, especially in GMAT DS: 2 is the only even prime number.<\/p>\n<p>See the factors post for more information about prime numbers.<\/p>\n<p>&nbsp;<\/p>\n<h2>Know Them Cold<\/h2>\n<p>Probably there&#8217;s nothing brand new in this post.\u00a0 Probably you have at least a dim memory, if not a perfectly clear understanding, of everything here.\u00a0 Whatever here is rusty, whatever is less than perfectly fluent, you need to practice until you know it cold.\u00a0 The GMAT is relentless in asking about these properties, and if you can nail them every time, you will be well on your way to a stunningly successful GMAT Quantitative section.<\/p>\n<p>&nbsp;<\/p>\n<p>Here are a couple of practice questions:<\/p>\n<p>1) <a href=\"http:\/\/gmat.magoosh.com\/questions\/880\">http:\/\/gmat.magoosh.com\/questions\/880<\/a><\/p>\n<p>2) <a href=\"http:\/\/gmat.magoosh.com\/questions\/317\">http:\/\/gmat.magoosh.com\/questions\/317<\/a><\/p>\n<p>&nbsp;<\/p>\n<h4>Special Note:<\/h4>\n<p>To find out where integer properties sit in the &#8220;big picture&#8221; of GMAT Quant, and what other Quant concepts you should study, check out our post entitled:<\/p>\n<p><a href=\"https:\/\/magoosh.com\/gmat\/what-kind-of-math-is-on-the-gmat-breakdown-of-quant-concepts-by-frequency\/\">What Kind of Math is on the GMAT? Breakdown of Quant Concepts by Frequency<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fact: one of the most tested categories of concepts on the GMAT Quantitative section\u00a0is Integer Properties &nbsp; What are the &#8220;properties of integers&#8221;? Probably none of these are brand new to you &#8212;- in fact, you probably learned about all these in grade school.\u00a0 Here&#8217;s a list. a) factors and multiples; GCF and LCM b) [&hellip;]<\/p>\n","protected":false},"author":26,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[160],"tags":[],"ppma_author":[13209],"class_list":["post-1489","post","type-post","status-publish","format-standard","hentry","category-arithmetic"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Integer Properties: The Most Common GMAT Question Topic - Magoosh Blog \u2014 GMAT\u00ae Exam<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/magoosh.com\/gmat\/integer-properties-the-most-common-gmat-question-topic\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Integer Properties: The Most Common GMAT Question Topic\" \/>\n<meta property=\"og:description\" content=\"Fact: one of the most tested categories of concepts on the GMAT Quantitative section\u00a0is Integer Properties &nbsp; What are the &#8220;properties of integers&#8221;? 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Beyond standardized testing, Mike has over 20 years of both private and public high school teaching experience specializing in math and physics. In his free time, Mike likes smashing foosballs into orbit, and despite having no obvious cranial deficiency, he insists on rooting for the NY Mets. Learn more about the GMAT through Mike's Youtube video explanations.","sameAs":["https:\/\/www.youtube.com\/c\/MagooshGMATChannel\/featured"],"award":["Magna cum laude from Harvard"],"knowsAbout":["GMAT"],"knowsLanguage":["English"],"jobTitle":"Content Creator","worksFor":"Magoosh","url":"https:\/\/magoosh.com\/gmat\/author\/mikemcgarry\/"}]}},"authors":[{"term_id":13209,"user_id":26,"is_guest":0,"slug":"mikemcgarry","display_name":"Mike M\u1d9cGarry","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/6b06de81592cd77bb46aa560cc59aee179cba4d042835c3529221ea1b344cce0?s=96&d=mm&r=g","user_url":"","last_name":"M\u1d9cGarry","first_name":"Mike","description":"Mike served as a GMAT Expert at Magoosh, helping create hundreds of lesson videos and practice questions to help guide GMAT students to success. He was also featured as \"member of the month\" for over two years at <a href=\"https:\/\/gmatclub.com\/blog\/2012\/09\/mike-mcgarrys-gmat-experience\/\" rel=\"noopener noreferrer\">GMAT Club<\/a>. Mike holds an A.B. in Physics (graduating <em>magna cum laude<\/em>) and an M.T.S. in Religions of the World, both from Harvard. Beyond standardized testing, Mike has over 20 years of both private and public high school teaching experience specializing in math and physics. In his free time, Mike likes smashing foosballs into orbit, and despite having no obvious cranial deficiency, he insists on rooting for the NY Mets. Learn more about the GMAT through Mike's <a href=\"https:\/\/www.youtube.com\/c\/MagooshGMATChannel\/featured\" rel=\"noopener noreferrer\">Youtube <\/a>video explanations and resources like <a href=\"https:\/\/magoosh.com\/gmat\/whats-a-good-gmat-score\/\" rel=\"noopener noreferrer\">What is a Good GMAT Score?<\/a> and the <a href=\"https:\/\/magoosh.com\/gmat\/gmat-diagnostic-test\/\" rel=\"noopener noreferrer\">GMAT Diagnostic Test<\/a>."}],"_links":{"self":[{"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/posts\/1489","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/comments?post=1489"}],"version-history":[{"count":0,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/posts\/1489\/revisions"}],"wp:attachment":[{"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/media?parent=1489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/categories?post=1489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/tags?post=1489"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/magoosh.com\/gmat\/wp-json\/wp\/v2\/ppma_author?post=1489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}