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## 1st grade

### Course: 1st grade > Unit 2

Lesson 9: Intro to addition with 2-digit numbers- Adding 2-digit numbers without regrouping 1
- Adding 2-digit numbers without regrouping
- Adding up to four 2-digit numbers
- Breaking apart 2-digit addition problems
- Break apart 2-digit addition problems
- Regrouping to add 1-digit number
- Adding by making a group of 10
- Regroup when adding 1-digit numbers

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# Adding 2-digit numbers without regrouping 1

Sal adds 71 + 24.

## Want to join the conversation?

- can someone tell me when we will use this in real life?(8 votes)
- Every time you go to the grocery store. Or balance your checkbook.(21 votes)

- someone plz help me plz someone

um.. wut is a 2 digit numbers I do not get it(4 votes)- a 2 digit number is when there are 2 digit, the tens and ones, in the number 59, 5 is in the tens place, and 9 is in the ones place. you will learn it in place values. So when meaning 2 digit number, there are two places like 23 15 63 77. there are 3 digit numbers like 334 544 759, when there are three place values.(6 votes)

- what is 100 going into 10 add them up and you will get your answer ask me if you need anything i am and a 5th grade(5 votes)
- What does it mean by "regrouping" and "without regrouping"?(2 votes)
- Watch a video.

As you can see by Richards comment, its a bit complicated to explain with just words.(2 votes)

- What is the number PI a measurement of(3 votes)
- Pi (π) is the ratio of the circle's circumference to its diameter so π = circumference/diameter or π = circumference/2 x radius .(4 votes)

- what do you mean nine groups of one or i misunderstood you sorry if im wrong(4 votes)
- 61 + 23 = 84

First you have to add the ones place. Doing this gives you:

1 + 3 = 4

Then you add the tens place:

6 + 2 = 8

Put it all together and you get 84

Same for 70 + 70. 0 + 0 = 0, and 7 + 7 = 14. Put the ones place's sum onto the other sum and you get 140.(6 votes)

- 95 is the anser(2 votes)
- Does it answer a big 95?(2 votes)
- why out of all the numbers you picked 7 and 1 :I(1 vote)
- He didn't pick them because they were better than other examples. He just picked two numbers at random and used those.(2 votes)

## Video transcript

- Try to pause the video and figure out what 71 plus 24 is. All right, now let's do this together. So let's think about what 71 actually means. Well we have a one in the ones place. Let me make this clear. So this is the ones place and we have one one. So that's that one one right over there. And then the tens place - in the tens place we have seven so we have seven groups of ten. One, two, three, four, five, six, seven groups of ten. So this really means seven tens and one one. This right over here, 71 boxes. Now we're going to add to that two tens. We're gonna add to that two tens; you see them here. One ten, two tens and four ones. And four ones. So what is that going to be? Well lets first thing about the ones. We have one one and four more ones. Well that's going to be five ones. That's going to be five ones, so we can count them right over there. This is five ones right over there. One one plus four ones is five ones. And then when you look at the tens; seven tens plus two tens. Well if you combine all of these together - if you combine all of these together you are going to have nine of these groups of ten. We're gonna have nine tens. Seven tens plus two tens is nine tens. So we're left with nine tens which we see right over here and five ones. And five ones. Well what's another way of saying nine tens and five ones? Well that's 95, and we're done.