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Aleonysh [2.5K]
3 years ago
8

Find 10-3. Write the subtraction fact two ways.

Mathematics
1 answer:
love history [14]3 years ago
4 0
This is a problem of fact families, but <em>what is fact families?</em> Well it is a family of four things. Two of them are additions and two of them are subtractions. So this question asks about fact families by w<span>riting the <em>subtraction fact two ways</em>. So we have:

</span><span>10-3

First way. So let's take the number 10 and explain this problem using triangles. Let's say that we have 10 triangles in the beginning:

</span>Δ Δ Δ Δ Δ
Δ Δ Δ Δ Δ

So I want to take away 3 triangles, then by taking away 3<em> what is left? </em>Well the answer is 7:

Δ Δ Δ Δ Δ
Δ Δ 

That is, if we subtract 3 from 10 then the result is:

10-3=7

Second way. In this subtraction we take the same 10 triangles:

Δ Δ Δ Δ Δ
Δ Δ Δ Δ Δ

Now I want to take away 7 triangles, then by taking away 7 what is left is 3:

Δ Δ Δ

That is, if we subtract 7 from 10 then the result is:

10-7=3

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