Okay, so to recap. In our first example, you are playing the role of a client representative and you have been asked to quantify how much concrete would be required to place a slab on grade for a future parking lot. The slab on grade will need to be 50 feet wide, by 75 feet long, by 8 inches thick. So the first operation that we're going to want to quantify is the surface area of the slab itself. So we're going to multiply 75 feet long by 50 feet wide, for a total of 3,750 feet squared. Next, you need to convert the thickness of the slab, which is eight inches for our example, into field. We can perform that calculation by dividing 8 inches into 12 total inches for 1 foot, and we come up with 0.67. To solve for a cubic measurement, you must multiply this factor by this factor, so it'll be 3,750 feet squared, multiplied it by 0.67 for a total of 2,500 cubic feet. Finally, you need to convert cubic feet into cubic yards. That simply is performed by dividing the cubic feet into 27, and that comes up with a total of 92.59 cubic yards. The next place we want to go, is we want to calculate the quantity of the rebar. We know that the rebar is going to be place linearly, therefore, the rebar will be 75 feet in length We need to calculate the width of the slab and convert it from feet into inches, so we could understand how many total lenient loss, our linear members, of rebar will be placed within the slab. So, that calculation is performed by multiplying 50 feet of the width times 12 inches for a total of 600 inches. We know from our problem example, that the rebar we placed 16 inches on center. So we can divide 600 into 16 to learn that there will be a total of 37.5 rebar within the project. The next calculation for rebar will be done or with the total linear footage would be of the material. We know that each rebar member would be 75 feet in length, so you multiple 37.5 times 75 for a total of 2,812.5 feet. Finally, we need to understand what the total weight will be for the assortment of material for rebar. Therefore, using the ASTM table, which we reviewed earlier, you know that number five rebar weighs 1.043 pounds per linear foot. So you would multiply 2,812.5 times 1.043, to learn that the total weight is 2,933.44. Okay, so the last item that you want to quantify with your concrete take off is, of course, the formwork. So we understand from our example, that we are building a slab on grade structure, for the purposes of a parking lot that is 50 feet wide by 75 feet long, that is eight inches thick. The sides of the slab, which is eight inches thick, is the actual surface area that we will quantify for the formwork. The top of the concrete will not have formwork typically placed on it as that will not aid to the curing process, which you want to keep moist. And, similarly, the bottom of the concrete slab will not have any formwork for two reasons. One, you're not going to be able to remove it after the concrete is cured. And two, the concrete will bind with the soil in the earth underneath it to create a more rigid structure, i.e., slab on grid. So, simply, our calculation for calculating formwork will be the thickest of the slab converted for feet. So that's 0.67 multiplied by 50 for the width, times two, as there are two sides, and then, again, 0.67 times 75 for the length times 2, because there are both sides. The top calculation runs out to be 67 square feet. And the bottom calculation runs out to be 100.5 square feet for a total of 167.5 square feet. So having gone through that exercise, you can see how paramount it is to keep organized when you're doing your take off models. But, effectively, these are the three items that you want to quantify in your estimate, which we will show you next. With example number one, after performing all the calculation, you'll want to quantify on your estimate for concrete scope, that the total bulk concrete is 92.59 cubic yards. The total amount of number five rebar quantified is 2,933.44 pounds. And finally, a total amount of formwork for 107.5 square feet.