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Current time:0:00Total duration:2:03

CCSS.Math:

let's get some practice estimating lengths so they tell us this line is one inch so that distance right over there is one inch about how long is a toy car well this is one of those lines that it just did so that's one inch but let's just see how many of those we need to go the whole length of the car so if I were to draw another one if I were to draw another one it's about that and I'm estimating it's not exact that would be two inches it's one inch that's two inches then that would be three inches and then that would be four inches four inches so it looks like the car is about four inches four inches let's do another one of these estimating length problems so I have a picture of two sunflowers right over here and they tell us that this first sunflower is 40 centimeters tall about how long is the second sunflower going to be well let's think about it if this entire distance if this entire height is 40 centimeters is about 40 centimeters and this sunflower if you look at its height if we look at its height I'll draw a dotted line here it looks like it's about half of the height of the taller centum of the taller sunflower so what is half of 40 going to be well 40 is for tens half of four tens is going to be two tens so this looks like it's about 20 centimeters 20 let me write it this way this looks like it's about 20 centimeters another way to think about it if this whole thing is 40 centimeters so then and this is what half would be 20 then this would be 10 centimeters let me write this this would be 10 centimeters this would be 20 centimeters then this would be 30 centimeters and then this would be 40 centimeters so we already saw that the sunflower is 40 centimeters tall and then this one would be half of that it would be 20 centimeters tall