What's one way we can check our answer to 2 × 10 = 20?

Solution:

We can use the factorization of a bigger factor into its smaller sub-parts to prove the identity.

Given,  2 × 10 = 20

Taking R.H.S into consideration which is 20

Splitting it into factors of 2.

= 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 

= 2 × (1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1)

= 2 × 10 = L.H.S

Since, L.H.S = R.H.S, hence the equation holds true.

Alternatively,

Let's write the prime factorization of 20: 

20 = 2 × 2 × 5

= 2 × (2 × 5)

= 2 × 10

Thus, we can make use of the prime factorization or additive property by adding all the factors of 20 in multiplicative form.

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What's one way we can check our answer to 2 × 10 = 20?

Summary:

We can make use of the prime factorization or additive property by adding all the factors of 20 in multiplicative form.