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## 3rd grade foundations (Eureka Math/EngageNY)

### Course: 3rd grade foundations (Eureka Math/EngageNY) >Unit 3

Lesson 2: Topic B: Foundations

# Adding 53+17 by making a group of 10

Sal adds 53+17 by breaking apart the numbers and making a group of 10.

## Want to join the conversation?

• can u show me a different way please.
• Another way is separating the tens from the ones in both numbers:(50+3) + (10+7)
Then reorganizing so the tens are together and the ones are together: (50+10) + (3+7)
And you get: (60)+(10)
Which adds up to become: 53+17=70
• Why do they make it so much harder than it actually is.
• They want to show you that numbers aren't just numbers on a page! Instead it's trying to teach you that these numbers can actually represent something, and that place values makes sense for a reason.

I know it all seems redundant, but it's helpful to show why everything works instead of just forcing you to do math the "normal" way.
• I'm confused by all of the math, is there another way to make it a lot easier
• Maybe just add the digits vertically, This is what works for me.
You can also use colours too.(or do something in a difference)
Ex. 53+17
= 50+(3)+17
=50+20
=70
• How can this be equal to 53+17=70? Why?
(1 vote)
• Well because if you were to break it down, into this 50 + 10 and 3 + 7
First, solve for 50 + 10, it equals 60
And 3 + 7 = 10
So 60 + 10 = 70
You get it?
• that video to counting decmal numbers such as 17,5 + 18,9 ?
• I have a problem that is 47+23
= 47 (__)+20
= (47 + __)+20
=__+ 20
= __
I've been working on this problem for an hour now and I still cant seem to figure out the problem somebody please explain this to me the video is not helpful thanks.
• you just had to separate the 3 from the 20

= 47 (3)+20
= (47 + 3)+20
= 50+ 20
= 70

Hope this helps.
• How do you figure out 53+17?
• 53+17
=50+3+17
=50+20
=20