Video instructions and help with filling out and completing Can Form 8453 S Estimated

Instructions and Help about Can Form 8453 S Estimated

In any math problem it's very important that you check your answers in this video we're going to go over when you do long division problems how you can go about checking your answers one way to make sure your answers somewhere closest to use estimates and you should be using estimates anytime you solve a math problem for this series of problems here we're just going to show you actually how you can check your answer all the way down to the hundredths or the thousandths place to make sure that your answer is 100% correct so all we need to do with a division problem is to take our answer so in this case 21 and then we're going to multiply it by the divisor or the number outside the box so we're going to 21 times 6 and if we did this all correctly that should equal 126 or the number inside the box so 21 times 6 we're going to set up our last box here and make sure the 21 times 6 is indeed 126 so set up our boxes with our diagonal lines then we're going to multiply 1 times 6 is 6 2 times 6 is 12 2 are adding and shirt off we're going to get 126 so we can say counter percent confidence that we solved this problem correctly draw a leaf under your title let's try one more for this problem we're going to check and see if 41 point 3 divided by 7 equals 5 point 9 so again we're going to multiply our answer five point nine times the number outside the box of the divisor so we're going to five point nine times seven and let's check this out and see again we're going to set up our lattice box and if you're good at your math facts it's really easy for you to check this very quickly it's five point nine times seven okay now we'll do our multiplication so 9 times 7 is 63 and 5 times 7 is 35 we'll do our addition so we get 413 and the decimal goes down and sure enough we get 41 point three so this we can say with 100% accuracy again forty one point three divided by seven equals five point nine make sure you're checking all your answers some answers are going to have a remainder so this slide is going to show you how to check your answer if it has a remainder so the first problem is 2560 7/5 I'm going to use traditional for this one so we ask ourselves how many times does 5 go into 25 five times and our steps are divide multiply subtract bring down so now we multiply 5 times 5 is 25 subtract bring down the next number how many times does 5 go into 6 one time now we multiply one times five is five subtract and bring down the last number how many times does 5 go into 17 I know that 5 times 3 is 15 so 3 times 5 is 15 leaves us with a remainder of 2 so the answer is 513 remainder 2 or at least I think that's what the answer is so to check an answer when you have a remainder the tip is is you're going to add the remainder in at the end like our tip says down here so we're going to do everything we would do on a normal checking your answer problem we're going to take this top number we're going to take our answer this number here and we're going to multiply it by 5 so 513 times 5 and I'm going to do my quick way of multiplying over here I'm not going to set up the lattice but you could absolutely set up a lattice 5 times 3 is 15 I'm going to carry the 1 drop the 5 5 times 1 is 5 plus 1 is 6 and 5 times 5 is 25 so the only difference now if it has a remainder is is that you're going to add the remainder at the end so now I'm going to come back over here with my remainder of 2 and now add that end down here so if I add a 2 here it's going to be 2567 and if that answer matches this number then we know we're correct so I know that I'm correct on this problem let's do one more just so you guys get the hang of it so 584 divided by 3 and I'm going to use partial quotients this time ok how many groups of 3 can we take out of 500 I'm going to start with 100 groups of 3 100 times 3 is 300 so check that out and I'm left with 284 let's see I know that 80 times 3 or 8 times 3 is 24 so I'm going to take out 240 groups ok left with 44 I know that 3 times 10 is 30 so let's take out 10 groups 10 times 3 30 ok I'm left with 14 I know that 3 times 4 is 12 so 4 groups of 3 is 12 and it looks like I'm going to have a remainder of 2 down here so add my partial quotients notice I have them all lined up correctly with my ones in my ones place tens in my tens place so it looks like our answer is 194 remainder 2 so ask yourself right now how would we check this answer to be sure it's correct well for now we're going to ignore the remainder we're going to add that in at the end so we're just working with this number and the number on the outside so I'm going to do my clique multiplication again 194 multiplied by 3 4 times 3 is 12 carry the 1 drop the 2 3 times 9