Question

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

Answer 1

Subtraction can be expressed two ways: 10 - 3 = 7, which indicates that subtracting 3 from 10 results in 7, and 7 + 3 = 10, which is the equivalent addition fact (inverting the operation).

Step-by-step explanation:

When asked to find 10 - 3, we do a straightforward subtraction such that, 10 - 3 = 7. However, the question also asks to write this subtraction fact two ways. The two ways to express this using the principle of subtraction are:

• 10 - 3 = 7
• 7 + 3 = 10

These equations relate the same mathematical fact. The first represents it as a subtraction, and the second as an addition (which is the inverse operation of subtraction).

Learn more about Subtraction

Answer 2

This is a problem of fact families, but what is fact families? 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 writing the subtraction fact two ways. So we have:


`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:

Δ Δ Δ Δ Δ
Δ Δ Δ Δ Δ

So I want to take away 3 triangles, then by taking away 3 what is left? 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`