tag:blogger.com,1999:blog-4242439961617529545.post5934300406954399164..comments2019-05-25T20:36:49.402+01:00Comments on Resourceaholic: Calculator WoesJo Morganhttp://www.blogger.com/profile/11919801458664779971noreply@blogger.comBlogger17125tag:blogger.com,1999:blog-4242439961617529545.post-50691684261314895042019-05-19T07:37:38.580+01:002019-05-19T07:37:38.580+01:00No question about the proper and correct use of a ...No question about the proper and correct use of a calculator.About mixed numbers-in Israel we stopped using it formally and talk about numbers greater than one(if positive)<br />johnnyhttps://www.blogger.com/profile/17723630460526670121noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-15231919042000926262019-05-18T08:57:56.209+01:002019-05-18T08:57:56.209+01:00Ooh - and one more thing. I have seen pupils try a...Ooh - and one more thing. I have seen pupils try and press shift and the key at the same time like they do on a computer. They don't know they have to press (and release!) shift first unless they're told this!Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-60995108855808523462019-05-18T08:54:18.204+01:002019-05-18T08:54:18.204+01:00A couple more thoughts on this following some Twit...A couple more thoughts on this following some Twitter chat...<br /><br />1. @larrylemonmaths said that he teaches the quadratic formula with brackets around the b squared. Given that this normally comes up on the calculator paper and students often fall into the 'squaring a negative incorrectly' trap, I think this is a good idea.<br /><br /><br />2. @mcwardgow told me that at her school Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-48885331488608701752019-05-18T08:39:06.449+01:002019-05-18T08:39:06.449+01:00In this country I reckon 99% of secondary pupils h...In this country I reckon 99% of secondary pupils have a Casio.Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-39414250507015766622019-05-17T23:16:33.198+01:002019-05-17T23:16:33.198+01:00There are so many bad cacluators though. First thi...There are so many bad cacluators though. First thing I do with almost any calculator I see is 1+2×3. 9. Ugh. In the bin. If it says 7 then I do 1÷9×9. 0.111111111. Ugh again. Can't beat Casio.jamesnoreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-1187044639617655582019-05-17T18:03:49.854+01:002019-05-17T18:03:49.854+01:00Ew, phone calculators are horrid things!Ew, phone calculators are horrid things!Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-60820500895044844442019-05-17T18:02:46.327+01:002019-05-17T18:02:46.327+01:00Bringing a calculator everyday (for other subjects...Bringing a calculator everyday (for other subjects too - not just maths) needs to be enforced. I started this year with seven Casio fx-85GTs to lend out (I bought them for £3.50 each in a sale) - I'm down to four now which is very annoying. Four is not enough, and because I don't have enough it means I rarely revise/teach calculator topics. Which is ridiculous. <br /><br />I have Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-59093624875062448132019-05-17T17:51:16.321+01:002019-05-17T17:51:16.321+01:00Nice - good idea to get them into the habit of wri...Nice - good idea to get them into the habit of writing squares out as multiplications. Habit forming takes a while, but is worth it if it builds understanding and helps avoid common mistakes.Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-87373298598778945702019-05-17T17:48:57.549+01:002019-05-17T17:48:57.549+01:00I did show them that button! 99% sure they won'...I did show them that button! 99% sure they won't remember it, but still. I do love that button.Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-59535997023595660882019-05-17T15:40:16.804+01:002019-05-17T15:40:16.804+01:00The FACT button before the shift key is pressed is...The FACT button before the shift key is pressed is also insanely useful - it converts decimals to hours mins and seconds! Kathrynhttps://www.blogger.com/profile/10412051882498831034noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-89969441190420108982019-05-17T10:40:52.574+01:002019-05-17T10:40:52.574+01:00I have a few GCSE retake tutees a year and I total...I have a few GCSE retake tutees a year and I totally get everything on this blog post. Evaluating the square of a negative number is one that constantly comes up. For questions where they have to substitute a value into an expression, I've got one of my current retake tutees to expand out a y squared expression as y X y and then substitute both the y values as whatever that negative number isAtul Ranahttps://www.blogger.com/profile/11259088181007986688noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-11549649035157560732019-05-17T09:52:40.773+01:002019-05-17T09:52:40.773+01:00I find many of the issues also come from the stude...I find many of the issues also come from the students reverting to phones rather than using their calculators and so missing out on that embedded practice@DagsMathshttps://www.blogger.com/profile/13910458679803751425noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-24652412172532596012019-05-17T08:49:51.004+01:002019-05-17T08:49:51.004+01:00Over the years the biggest problems have been with...Over the years the biggest problems have been with the pupils who don't have or don't regularly use their own calculator (you seem to have a room full!). They then turn up with a brand new one, or have to borrow again, for the exam and don't know how to use that one especially for powers and fractions as you describe.Singing Hedgehoghttps://www.blogger.com/profile/04594317170233264009noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-10815099611626114382019-05-17T08:02:37.658+01:002019-05-17T08:02:37.658+01:00Great! That's helpful, I will make sure I teac...Great! That's helpful, I will make sure I teach it in future. Presumably most GCSE cohorts for the next few years will still be using the calculators they bought in Year 7. So in most schools it will be a few years before we see GCSE students using the 83GTX in exams.Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-31691325915457586402019-05-17T07:59:53.554+01:002019-05-17T07:59:53.554+01:00Yes, I see lots of pupils doing eg long multiplica...Yes, I see lots of pupils doing eg long multiplication by hand in the calculator paper! (and getting it wrong!).Jo Morganhttps://www.blogger.com/profile/11919801458664779971noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-22131702219481828932019-05-17T05:25:28.582+01:002019-05-17T05:25:28.582+01:00"We know that GCSE students make this mistake..."We know that GCSE students make this mistake all the time when asked to plot quadratic graphs." Top tip if this is on a calculator paper: the new TABLE mode on the fx-83GTX makes it even easier to input a formula and evaluate it over a range of values. Now you can even extend the range by pressing = at the end, or type a new value into the table and move it forward and back with + and adamcreenhttps://www.blogger.com/profile/08847869366634507731noreply@blogger.comtag:blogger.com,1999:blog-4242439961617529545.post-85774580861977991982019-05-17T01:08:57.997+01:002019-05-17T01:08:57.997+01:00This is exactly how I feel about calculators. I...This is exactly how I feel about calculators. I'm teaching FE resits foundation of course. All the things you mention we have to teach explicitly! This post made me chuckle! I often get students to use their calculators to check non-calc answers & it frustrates me they don't use them enough in the calculator papers! Janethttps://www.blogger.com/profile/02636294338715203450noreply@blogger.com