Fourth Grade - Lesson 1.6 Adding Whole Numbers
May 19, 2015
Hello, my name is miss Kochi, from PS1 O one, school in Brooklyn. Today we're going to learn how to add home numbers. Our aim X is us. How can we add whole numbers and determine whether solutions to addition problems are reasonable? First example here is to add or find the sum of 570,000 374 with 86,051. It is very important to line up the add ins by police value when adding the two numbers. For example, we have 500, 70,000, 374. Plus 86,000 51. This is our ones. Column is our tens. This column here is our hundreds. Thousands. 10,000s. 100,000s. I am abbreviating. Now we can add. Adding up our ones place. I like to draw these columns, so we do not get confused in which the place values where. Four and one is 5. The tens. 7 plus 5 is 12. We need to regroup. Place out two here and carry over our one. One plus three is four. In our hundreds place. Next we're going to add the thousands zero plus 6 is 6. 10,000. 7 plus 8 is 15. We need to regroup, bringing our 5 down and carrying over one. One plus 5 equals 6. Every three digits. The separation. So our answer is 656,000 425. Let's apply this to a word problem. Alaska's glacier bay national park had 418,911 visitors in 2008. A park had 444,653 visitors in 2009. How many people visited the park in 2008 and 2009. Based on this word problem we know that there are 418,911 visitors that came to the park in 2008. It also had 444,653 visitors in 2009. The question asks us to find how many people visited the park in both years 2008, 2009. So we need to find the sum of the two numbers. 418,000 911 plus 444,000 653. I'm going to make sure that I lined everything up. And I now notice that my add ins are in the right place value. Now I can add one plus three equals four, one plus 5 is 6. 9 plus 6 equals 15, which I need to regroup. 5 carry over the one which is 1000. One plus 8 is 9 plus four is 13. Again, regrouping three carry the one. One. Plus one is two plus four equals 6. And I'll ask column the 100,000s, four plus four equals 8. One, two, three, so our sum equals to 800 63,000 564 visitors.