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Topic 11 Lesson 11-4 Subtract using Mental Math

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hey guys today we're doing 11-4 guy on page 655 subtract using mental math all right Amy and Jorge enter their pumpkins giant pumpkin contest Amy's pumpkin weighs 335 lb where is Pumpkin weighs 302 lb how many more pounds does Amy's pumpkin show how you can use Mental Math to mental math is a good tool guys that I think with problems like this it's very easy to just Criterion throughout teething ring your problem out and solve it by -2 3 3-0 is 3 and then 3-3 and 0 so your answer is 33, right 33 more pounds k I did the next page use any strategy to subtract and show your work so if you like the number lines you definitely can ship try those if you just want to write them one on top of the other like we've been doing and solve it totally good to all right so this one is done for you but I'm going to write the problem and show you the work so that you know how to do it now you know how to regroup with the traction and two digit numbers of the same thing as three digit 5-6 we can't do that because five is smaller than 6 we're going to borrow a 10. Becomes 7 that becomes 15 - 697 - 3 is 4 and 4 minus 1 is 3 349k going to do the same thing here I was going to do it on the side here so you can see it better 7 - 1 is fix 5-6 I can't do that to Navarro from the hundred I ain't that becomes 3 this becomes 1515 - 6 + 9 196 hey 342 134 and your track 2-4 I can't do that with the four becomes three two becomes 12 12 mile 4 is 8 3 - 3 is 0 - 1 is to 208 K you guys know how to do this 321 - 1 Android 15 1-5 I can't the one that becomes 11 11-5 I can do that sticks 1 - 1 is 0 and 3 - 1 is 2 206 change this showing your work when you saw that a problem like that that is showing your work okay breakdancing here okay I going to do number five and six K you are going to do 5 6 7 8 9 and 10 K and then stopped right now and then I will finish everything else after chat you do 7 8 9 and 10 on your arm and it give you a minute all right you can pause the video all right do your work and then replay the video or press play again to see the rest. That way you're not doing it as I'm doing it you're doing it yourself and then checking okay the plaza video now and then you're dumb number 10 press play again this one's tricky make sure you're paying attention to what I'm doing then it becomes 9 right 14 - 86 + 9 - 9002 - one can't go ahead to borrow from the hundred to to fix the tens and then borrow from the tens to fix the one that's a little tricky alright 11 Leo says that the difference 526 - 217 is greater than 200 is his answer reasonable that's the way I would say I would say that 526 is closest to 500 and I would say that 217 is closest to 200 songs about to track those numbers and that would be 300 right 300 is greater than 200 so I say yes because 500 - 200 equals 300 right I made them closer to a whole hundred that way it's easier to subtract and if it's answers bigger than 200 paint that's a little bit tricky but just know that you can change your number to the nearest hundred all right left th number 12 PIAA collected cans to raise money for school she collected 569 cans on Monday do you collected some more cans on Tuesday and now she has 789 how many cans did she collect on Tuesday so now you know you have the bigger number minus the smaller number will get you hurt answer for Tuesday okay 9 minutes 9 - 9 + 0/8 - 6 is 2 + 7 - 5 is too so she collected 220 cans right I want you to try 13 on your own okay you're going to you can try 14 it's just a number for the story problem and 15 can I go pause here do 13 14 15 and then play it again you'll see my answers believer 453 stamps in his collection Emily has 6 762 stamps how many more stamps boy okay bigger number always comes first in subtraction so make sure even though the smaller number was first in the problem it's not the bigger okay she has 309 more stamps so write a subtraction problem about recycling 123 digit numbers and I'm going to use words to write my problem now but it might not be very deep okay there are a hundred and six cans there are 321 bottled how many more file there we go need to be recycle then cans can can you soon just going to do your erase was infected right through your number on top tubing to do 321 - 106th and a solvent 215 can you can make that problem however you want that's just my example and I'm sorry my handwriting is sloppy hard to write small at this time 15 on Saturday 28 fewer boys and girls played in soccer matches if 214 girl play how many boys that would be 214 - 28 help for my fate I can't do have become 1440 North 86th I can't do something to borrow it. Becomes 1010 - 281 - 0 is 1 the 186 District can't remember to pause and I stayed so you can do your own work and then you press play and check your work okay

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Topic 11 Lesson 11-4 Subtract using Mental Math

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