Monday, May 11th

This week we are going to be wrapping up our work with addition and subtraction within 1,000!! You will notice that the lessons will only be the problem sets. At this point it is review and practice - which is VERY IMPORTANT - but you don't have to do 1,000 problems to show you are a Math Rock Star!!

So, let's get to it! Here is the link if you would like to watch a video of the lesson! https://www.youtube.com/watch?v=NnanXV20MmU

1. Solve by drawing chips on the place value chart. Then use addition to check your work.

699 - 210 =

We can tell right away that this won't have any regrouping because the number we are subtracting from has nines in the tens and ones places. EASY!! We draw 699 ONLY because this is a subtraction problem. We start our crossing off in the ones place. 9 - 0 = 9. Moving on over to the tens... 9 - 1 = 8. And we finish in the hundreds 6 - 2 = 4. So we are pretty sure our answer is 489. Set it up vertically. 699 on top of 210. 9- 0 = 9. 9 - 1 = 8. 6 - 2 = 4. To check the work, we bring the 489 to the top of the addition problem. Then I add back the 210. If we did it correctly, we should get 699. Let's see...9 + 0 = 9. 8 + 1 = 9. 4 + 2= 6. Bingo was his name - o!!

You try b.

Let's look at Page 2.

c. 788 - 299 =

I know to only draw 788. I also know that I start in the ones. I have 8, but need to cross off 9. I don't have enough, so I have to go to the tens and cross off a ten (decompose a ten) and bring it over to the ones place. Now I have 18 ones and I can cross off 9. That leaves me with 9 ones. Next we move to the tens place. Now I have 7 there and want to cross off 9. Can't do that, so I go to the hundreds, and cross one off (decompose a hundred) moving it to the tens. Now I have 17 tens and can cross off 9. That leaves me with 8. Last step is to cross off the 2 hundreds. That leaves me with 4. So I believe the answer is 489. Next is to solve it vertically. I write 788 on top and neatly line up 299 underneath. I can't do 8 - 9, so I cross off the 8 in the tens place making that a 7 and the 8 ones 18. 18 - 9 = 9 . I see that I have 7 - 9 in the tens, but I can't do that. so I have to cross off the 7 in the hundreds and make it a 6, and the 7 in the tens becomes 17. 17 - 9 = 8. in the hundreds I have 6 - 2 = 4. To check this with addition, I bring the 489 up to the top of my problem and add 299 to it. I know to start in the ones. 9 + 9 = 18, I keep the 8 and carry the 1. Then I add my tens. 1 + 8 + 9 = 18, so I keep the 8 and carry the 1 to the hundreds place. Last I add up my hundreds. 1 + 4 + 2 = 7. Did I get 788???? Yes I did!!!!

You try letter d. by yourself.

Page 3. Complete all of the if...then statements. Draw a number bond to represent the related facts.

a. If 762 - ____ = 173, then 173 + 589 = ________.

Well, If these form a number bond, then the two parts should equal the whole which should be the biggest number. So 173 + 589 should equal 762. Let's see if it does. I start with 173 and neatly line up 589 underneath it. I start in the ones by adding 3 + 9. I get 12 so I keep the 2 and carry the 1. Then I add up my tens, 1 + 7 + 8 = 16. I know to keep the 6 and carry the 1 to the hundreds. 1 + 1 + 5 = 7. Therefore the whole is 762. That means the parts are 589 and 173. The first missing space is 589 and the second one is 762. In the number bond the 762 goes in the biggest circle on top and the 589 and 173 goes in the bottom circles.

You try letter b. by yourself.