Your child appears to need to create a BBC account and log in though, which they don't for normal kids programmes, seems strange.
At least on our smart TV iPlayer there's now a kids profile as well as my standard BBC account login and you don't need to sign in to watch it on that one.
We watched them this evening - it's basically a 20 minute programme broken down into an intro > supermovers on something maths related > little bit of maths input > celeb reading a book extract or poem > bit more waffle > little bit of history. I'm not sure I'd manage to hook the school work at home around it, especially having two in different key stages who both need lots of prompting to do anything and not interfere with their sibling - but I bunged it on for the post-tea TV slot before we resort to our usual fallbacks of Operation Ouch or Art Ninja and the kids enjoyed it.
Just in case you were expecting three separate programmes - it seems to be intended you watch it all and then pootle off to the BBC website to follow on from it - but I found the KS1 one pitched a bit low for my above middly Y2 kid Maths-wise. They're big Karim fans from Strictly though so watched both the KS1 and lower KS2 ones.