Counting by tens

so we are told let's count by tens and we go 10 20 Blanc 40 50 60 70 80 90 hundred what number did we miss pause the video what number did we miss right over here well if we're counting by tens we would go 10 20 30 40 50 60 70 80 90 100 so we're missing 30 so which choice right over here has 30 well if we scroll down a little bit we see right there that is our choice let's do another example so here we are asked which 10 frames show 20 and a 10 frame is just a fancy word for one of these blocks over these frames that have 10 objects in it you could see it right over here 1 2 3 4 5 6 7 8 9 10 so which of these 10 frames show 20 well 20 is 2 groups of 10 so this is 10 and then 20 so that's 20 right over there choice B is 10 20 30 40 choice C is 10 20 30 so we could feel good about choice a here we're told drag the ten frames into the box to make 40 so let's see here this is 10 right over there then we get another 10 gets us to 20 then another 10 gets us to 30 and then finally another 10 gets us to 40 10 20 30 40 we're done