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#mathstratchat

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Karen Campe<p>New blog post! "Mental Math Monday" summarizing last week's question and many different calculation strategies.<br><a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/T3Learns" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>T3Learns</span></a> <a href="https://mathstodon.xyz/tags/MathChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathChat</span></a> <a href="https://mathstodon.xyz/tags/MentalMathMonday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MentalMathMonday</span></a> <a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> <a href="https://mathstodon.xyz/tags/ElemMathChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ElemMathChat</span></a> <a href="https://mathstodon.xyz/tags/MathSky" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathSky</span></a> <a href="https://mathstodon.xyz/tags/MathsToday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathsToday</span></a> <a href="https://mathstodon.xyz/tags/ClassroomMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ClassroomMath</span></a> </p><p>Thanks to Howie Hua!!!</p><p><a href="https://karendcampe.wordpress.com/2025/04/07/mental-math-monday/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">karendcampe.wordpress.com/2025</span><span class="invisible">/04/07/mental-math-monday/</span></a></p>
dendrite<p>A fun podcast I found today. Math is figureoutable<br /><a href="https://www.mathisfigureoutable.com/" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="">mathisfigureoutable.com/</span><span class="invisible"></span></a><br />Every Wednesday they share a mental math prompt . <br />Here is my solution for 16x75<br /><a href="https://mastodon.world/tags/mathstratchat" class="mention hashtag" rel="tag">#<span>mathstratchat</span></a> <br />Fell free to share in Twitter or Instagram if you like. I no longer go there</p>
Karen Campe<p>And on TW, Susan Russo used difference of two squares, which I hadn't thought of.<br>Cool!<br><a href="https://twitter.com/Dsrussosusan/status/1628146466098188289?s=20" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">twitter.com/Dsrussosusan/statu</span><span class="invisible">s/1628146466098188289?s=20</span></a></p><p><a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathEd</span></a> <a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a></p>
Karen Campe<p>I am happy with those 3 versions of mentally computing 83 x 97. </p><p>Please share your <a href="https://mathstodon.xyz/tags/ProblemSolving" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProblemSolving</span></a> strategies here or on the post <a href="https://karendcampe.wordpress.com/2023/02/04/february-calendar-problems/" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">karendcampe.wordpress.com/2023</span><span class="invisible">/02/04/february-calendar-problems/</span></a></p><p>More <a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> on Wednesdays from @pwharris<br> &amp; mental math Mondays from @howie_hua</p><p><a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a></p>
Karen Campe<p>Here's another multiplication using the area model to show double distribution. <br>Same four partial products as above: <br>80•90 + 80•7 + 90•3 + 7•3<br>Total = 8051 </p><p><a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> <a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/ProblemSolving" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProblemSolving</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathEd</span></a></p>
Karen Campe<p>How about decompose with a target number? </p><p>83 • 97<br>83•(100 – 3)<br>83•100 – 83•3<br>8300 – 249 [bc 80•3 + 3•3]<br>8300 – (250 – 1)<br>8300 – 250 + 1<br>8050 + 1 = 8051</p><p><a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> <a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/ProblemSolving" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProblemSolving</span></a></p>
Karen Campe<p>Notice that I didn't say "FOIL" above... I chose to say repeated distribution since that more generally describes the math I am doing. <br><a href="https://mathstodon.xyz/tags/WordsMatter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WordsMatter</span></a></p><p>How else might I do this problem? </p><p>Double &amp; halve isn't a great strategy because neither number is even. <br><a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a></p>
Karen Campe<p>83 x 97 <br>My first thought is decompose &amp; distribute:</p><p>(80 + 3)•(90 + 7)<br>80•90 + 3•90 + 80•7 + 3•7<br>7200 + 270 + 560 + 21</p><p>Now combine by place value:<br>7200 + 200 + 500 = 7900<br>70 + 60 + 21 = 151</p><p>Total = 8051</p><p><a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> <a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathEd</span></a></p>
Karen Campe<p>Here is problem 1.<br>Reminder that for <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> I am sharing my thinking process... no need to jump in with suggestions (altho your own <a href="https://mathstodon.xyz/tags/ProblemSolving" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProblemSolving</span></a> always welcome at the end of the thread).</p><p><a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a><br>Explain how to multiply 83 x 97 using mental arithmetic.</p>
Karen Campe<p>Reminder that I posted a February Calendar of Problems from an old nctm journal. Please share w/your students or try <a href="https://mathstodon.xyz/tags/ProblemSolving" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProblemSolving</span></a> yourself!</p><p><a href="https://karendcampe.wordpress.com/2023/02/04/february-calendar-problems/" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">karendcampe.wordpress.com/2023</span><span class="invisible">/02/04/february-calendar-problems/</span></a></p><p>In this thread, I will <a href="https://mathstodon.xyz/tags/TryMathLive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TryMathLive</span></a> with one of the problems!<br><a href="https://mathstodon.xyz/tags/MTBoS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTBoS</span></a> <a href="https://mathstodon.xyz/tags/iTeachMath" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>iTeachMath</span></a> <a href="https://mathstodon.xyz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a> <a href="https://mathstodon.xyz/tags/MathEd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathEd</span></a></p>
Elishevacarl<p><span class="h-card"><a href="https://mathstodon.xyz/@davidwees" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>davidwees</span></a></span> <span class="h-card"><a href="https://a.gup.pe/u/mtbos" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>mtbos</span></a></span> celebration of multiple methods and presentations. I found the <a href="https://mathstodon.xyz/tags/mathstratchat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathstratchat</span></a> discussions some of the most engaging and empowering. <a href="https://mathstodon.xyz/tags/mtbos" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mtbos</span></a> <a href="https://mathstodon.xyz/tags/mathed" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathed</span></a></p>
meganisalanis<p>Over on the bird site I have enjoyed a series of threads with a maths problem with the request to share your strategy - Pam Harris runs it. I can't see her on here yet.<br>This morning I saw the problem 4896÷96</p><p>How would you solve it?</p><p><a href="https://mastodon.nz/tags/MathStratChat" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MathStratChat</span></a><br><a href="https://mastodon.nz/tags/mathsisfun" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mathsisfun</span></a> <a href="https://mastodon.nz/tags/Maths" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Maths</span></a> <a href="https://mastodon.nz/tags/Numbersense" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Numbersense</span></a></p>