Kim and Jamie are best friends. They are playing in Kim's sandbox and decide to build sandcastles. Jamie's sandcastle area is four tiles across and seven titles down. Kim's sandcastle area is three tiles across and seven titles down. How many titles does Jamie's sandcastle use? How many titles does Kim's sandcastle use? What is the total area of the sandbox? How many titles does Jamie's sandcastle use? How many titles does Kim's sandcastle use? What is the total area of the sandbox? Our first part of the question ask us, how many titles does Jamie's sandcastle use? That is the yellow portion of the sandbox. So, let us count the number of tiles that are in the Jamie's part of the sandbox. One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty-one. How many titles does Jamie's sandcastle use? Twenty-one. The second part of the problem ask us, how many titles does Kim's sandcastle use? Let us count and see how many tiles are in Kim's part of the sandcastle. One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty-one, twenty-two, twenty-three, twenty-four, twenty-five, twenty-six, twenty-seven, twenty-eight. So, there are twenty-eight tiles in Kim's part of sandbox. What is the total area of the sandbox? To find the total area, we know that we need to multiply the number of tiles going across by the number of tiles going down. So let us count to figure out, how many tiles are going across and how many tiles are going down. One, two, three, four, five, six, seven. There are seven titles going down. Now, let us count to see how many tiles are going across? One, two, three, four, five, six, seven. There are also seven titles going across. Our area for formula will be seven times seven. Seven times seven is forty-nine. So the total area of the sandbox is forty-nine. Now, let us check and add the number of tiles of Jamie's part of the sandcastle and Kim's part of the sandcastle together to see if we get our total area. Jamie has twenty-one tiles and Kim has twenty-eight tiles. One plus eight is nine, two plus two is four. Altogether, we have forty-nine tiles, which is the same is what we have found for our total area. So, our numbers check out.