If a number is even, then we can
divide it into two equal groups. This means that every even number
can be written as a doubles addition sentence. Five plus five equals 10. For example, we know that 10 is
even because 10 equals five plus five. Which of these addition sentences
shows us that 12 is even? Eight plus four equals 12, five
plus seven equals 12, nine plus three equals 12, or six plus six equals 12?
We can tell a number is even if it
can be written as a doubles addition sentence. We know 10 is even because 10 is
equal to five plus five. Doubling is when we add the same
number together twice. Five plus five is the same as
The question asks us which addition
sentence proves that 12 is even. We’re looking for a doubles
addition sentence, where we add the same number together twice. Eight plus four does equal 12, but
eight and four are different numbers. Five and seven does equal 12. But this is not a doubles addition
sentence either, because five and seven are different numbers.
Nine and three also makes 12. Again, this is not a doubles
sentence because the two numbers are different. Six plus six equals 12, and this is
also a doubles addition sentence. We’re adding six together
twice. Six plus six also makes 12, and
it’s a doubles addition sentence. We’re adding together six
twice. The addition sentence that shows us
that 12 is even is six plus six equals 12.