Ethan has drawn this picture to show that 16 is an even number. His teacher asks him to complete the addition sentence that shows that 16 is even. What plus what equals 16. He knows he needs to write the same number in both boxes. What number is this?
Ethan has drawn a model to show that 16 is an even number. There are 16 squares. And Ethan has divided them into groups of two. Two, four, six, eight, 10, 12, 14, 16. How many groups of two are there? One, two, three, four, five, six, seven, eight. So we know that we can take 16 and divide it into eight groups of two. If we start at zero and we count forward in twos, the numbers that we land on are even numbers. So by dividing his 16 squares into groups of two, Ethan has shown us that 16 is an even number.
Ethan’s teacher has asked him to find an addition sentence that shows that 16 is even. He has to write the same number in both boxes. Which number do we add to itself to make 16? If both of the numbers are the same, that means they’re equal. Can we divide our 16 squares into two equal groups? Yes, we can. All we need to work out now is how many squares there are in each group. One, two, three, four, five, six, seven, eight. The missing numbers from the addition sentence are eight and eight. Eight plus eight or double eight equals 16. The missing number is number eight.