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Current time:0:00Total duration:3:37

Video transcript

Jacque took a submarine to the bottom of the ocean and discovered an underwater city the starfish ruled the city this this is fascinating there were 59 sea horses there which was 28 fewer than the number of starfish 28 fewer then the number r2 used that color then then the number of starfish how many starfish how many starfish were there so let's think about the second sentence here so number of seahorses is 28 fewer than the number of starfish so we could write we could write number of seahorses seahorses is 28 fewer than the number of starfish so that means that this is going to be equal to the number of starfish number of starfish starfish minus 28 28 fewer than the number of starfish so let me write that in blue so if I have the number of starfish and I get when I go 28 fewer than that that's going to be the number of seahorses that's what they tell us the number of seahorses there were 59 seahorses there which was 28 fewer than the number of starfish and they actually tell us what the number of seahorses is it's 59 so we can write this as we can write this as 59 is equal to the number of starfish number actually maybe I'll just draw it well I'll write it out starfish the number of starfish - 28 - 28 or another way to think about it is there's 28 more starfish than seahorses so we could rewrite this as saying well whatever the number of seahorses are whatever the number of seahorses are they tell us there are 59 seahorses there's going to be 28 more there's going to be 28 more starfish and whenever you do a problem like this it's always a good idea just to do a check just to say okay are there going to be more starfish or more seahorses and when you look at the information they give us they say there are five g9c horses which was 28 fewer than the number of starfish so if there are fewer seahorses and starfish that tells you there's going to be more starfish so it makes sense if you want to go from the seahorses the number of seahorses the number of starfish you would add 28 because there's more starfish than seahorses so now we just have to figure out what 59 plus 28 is so let's do that so 59 is five tens and nine ones 28 let's write the two tens in the tens place and the eight ones in the ones place or we're adding we're going to go from the number of seahorses and 28 more than that to get to the number of starfish so let's first go to the ones place nine ones plus eight ones is 17 ones right the seven ones and 110 or you can think of it as I carried the one but all I did is I wrote the the 110 in 17 I wrote that in the tens place and now I can add one ten plus five ten plus two tens so let's see one plus five plus two is eight eight tens so the number of starfish is 87 and you should always see if that makes sense the number of starfish is this right over here is 87 so if there are 59 seahorses is that twenty-eight fewer than 87 sure it is it's exactly 28 fewer in fact that's what we used to solve this question