COSY 3-Digit Take A Number System, 4" Digits

all right so we're going to multiply some large numbers today four digits times three digits you may want to refer back to the turtle method turtle method was two digits times two digits this is going to be a little more require a little bit more concentration let me show you how to check for reasonableness before we actually start this alright so and it's an estimation skill so 4925 is basically five thousand so write five thousand down three hundred sixty a if you're rounding up to the hundreds this is going to round up to four hundred this is going to be a really quick way to check and for you to just have in your mind hey this is the number that I'm shooting for it's close it's going to be close to this so this is middle math four times five it's 20 count your zeros one two three four five one two three four five do you see what I mean this is going to be a large number so every thr