number

1st Grade Math: Number Bonds and How to Use Them



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hi parents Danielle the tutor here

welcome to our teacher child series

first-grade today's lesson will be on

number ones we'll be talking about what

it is and why it's so important a number

bond is a model that represents the

relationship between

a total and its parts it consists of

three boxes the top box is the total and

the two boxes that connect to it

represent the parts so if we were to

fill in this example see how we have two

parts we have three green dots and two

orange dots but altogether we have five

dots so we would fill that in we would

put a 5 in the top box because that

represents all of the dots or all of the

objects in the bottom two boxes we'll

put three and two since that represents

the parts now a number bond is important

because it helps us to see to visually

see a decomposition or how we break up a

number like the number five now

something that we will address in a

future lesson is that five can be broken

up into many different ways in a number

bond will actually help us to see them

now let's try an example if we take a

look at this I see a bunch of dots we

have green and orange dots we're going

to put this into a number bond

so let's first address what we have I

see three things here we have dots we

have green dots and we have orange dots

now notice that I said dots to represent

all of what we have so you want to

categorize what you have something like

that now let's talk about how many of

each we have how many dots do you see we

have six you can have them counted out

if you would like how many green dots do

you see if you count it out we have four

and how many orange dots do you see two

now let's talk about what each of these

numbers represents so that we can put it

into a number bond the dots or the six

dot

does that represent all or some of the

objects that you see in the picture

hopefully you see that they represent

all of them so that would be the total

or the same thing as total so that would

actually go in the top box since six is

our total what about four do the four

green dots represent all or some of the

objects some of them because there are

still more objects besides the green

ones so that would actually be called

apart and lastly the two orange dots

does that represent fall or some of the

objects in the picture just some so that

would be another part now our number

bond should look something like this

since six is the total it will go in the

top box connected to two other boxes

which represent our parts four and two

now do you think it matters if I put

four here and two here or if I could put

two in the first box and four in the box

second box well do four and two make six

yes does two and four make six yes so

then order doesn't matter very much in

an upper bound let's take a look at the

number sentences that we make from these

number bonds now notice that we started

with a group the green dots and another

group the orange dots then we put them

together to make a total how can we

write this or what operation would we

use to represent what we just did we're

putting things together we're combining

them so that is addition so we took our

parts added them together to make a

total so for this number bond we could

write four plus two equals six and this

number bond we could write two plus four

equals 6

now notice that we have two different

equations

they're both addition to Asians or

edition number sentences

but they have the same result they have

they both equal the number six since

they both have the same result

they have technically the same meaning

or they're equivalent

four plus two has the same meaning as

two plus four now this is a popular

property that your student needs to

understand it's called the commutative

property your student doesn't need to

know the name commutative but they do

need to understand the concept they need

to know that four plus two can be

written as two plus four and they can

that the order can change in addition

well I hope that helps thanks for

watching today's lesson on number bonds

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