Math for LA Contractor Questions with Correct Answers/
Verified/ 100% Pass
A wall is 32' long and studs are spaced 16" on-center, how many studs are needed for this wall? -
✔️✔️25
A wall is 44' long and studs are spaced 16" on-center, how many studs are needed for this wall? -
✔️✔️34
If studs are placed 16" on center, what is the measurement from the right corner to the right edge of
the 4th stud? - ✔️✔️48-3/4 = 47 1/4
A wall measures 8' from the bottom of the sole plate to the top of the top plate. The wall is
constructed with a single plate on the top and a single plate on the bottom. What is the cut length of
the stud? - ✔️✔️8'-3" = 7'9" or 7.75
A wall is 32' long, 8'-1 1/2" from the bottom of of the sole plate to the top of the double top plate.
Studs are spaced 16" on-center. Assuming there are no openings, calculate the linear feat of lumber
in the wall. - ✔️✔️289.75
A wall is 32' long with studs 16" on center. IT measures 8" from the bottom of the sole plate to the
top of the single top plate, assuming no framed openings, what is the total linear feet of lumber in
the wall. - ✔️✔️25x7.75= 193.75 2x32-64 64+193.75=257.75
If a header is 37-1/2' wide, what is the measurement for the rough opening? - ✔️✔️32
Calculate board feet of lumber in 12 - 2x8 floor joists that are 14' in length - ✔️✔️224
Calculagte board feet of lumber in 10 studs that are each 8' in lenght - ✔️✔️53.33
Given: 100 pounds of nails cost $35, there are 250 nails per pound. There re 80 shingles per roofing
square and 4 nails per shingle. What would be the total cost of the nails for 47 roofing squares? -
✔️✔️21.06
How mahy tread sdoes it take to get toa 9' vertical height? - ✔️✔️14 residential (7.75")
, 15 commercial (7")
How many square feet are in a sheet of 4x8 plywood? - ✔️✔️32
Given: Two walls are 96'x8' and two walls are 40'x8'. HOw many sheets of 4x8 plywood are needed
for these walls? - ✔️✔️68
The run of a building that is 50' wide - ✔️✔️25'
The run of a bulding that has a span of 64' - ✔️✔️32'
The gable height of a bulding that is 36' wide with a 4:12 slope - ✔️✔️(18x4)/12 = 6'
The gable height of a bulding that is 28' wide with a 6:12 slope - ✔️✔️14x6 = 84" & 7'
A building is 57'x39' with a hip roof and a 1" overhang will have a ridgeboard length of - ✔️✔️18
(DO NOT INCLUDE THE OVERHANG)
A 41'x41' building with a hip roof and a 2' overhang on each side will have a ridgeboard length of -
✔️✔️0 (41-41=0)
What do you put up first on a roof? - ✔️✔️Ridgeboard
What is the vertical rise of a 24' wide building with a 1/3 pitch? - ✔️✔️96"
What is the slope of a roof that has a 1/4 pitch - ✔️✔️6:12 (6x12=72)
What length material will you order for the common rafter for a building that is 38' wide with a 1'
overhang? The roof slope is 4:12 - ✔️✔️22' lumber
How many square feet is the roof of a house that is 48'x32' with a 2' over hang all the way around
and a 3:12 slope? - ✔️✔️1931
Verified/ 100% Pass
A wall is 32' long and studs are spaced 16" on-center, how many studs are needed for this wall? -
✔️✔️25
A wall is 44' long and studs are spaced 16" on-center, how many studs are needed for this wall? -
✔️✔️34
If studs are placed 16" on center, what is the measurement from the right corner to the right edge of
the 4th stud? - ✔️✔️48-3/4 = 47 1/4
A wall measures 8' from the bottom of the sole plate to the top of the top plate. The wall is
constructed with a single plate on the top and a single plate on the bottom. What is the cut length of
the stud? - ✔️✔️8'-3" = 7'9" or 7.75
A wall is 32' long, 8'-1 1/2" from the bottom of of the sole plate to the top of the double top plate.
Studs are spaced 16" on-center. Assuming there are no openings, calculate the linear feat of lumber
in the wall. - ✔️✔️289.75
A wall is 32' long with studs 16" on center. IT measures 8" from the bottom of the sole plate to the
top of the single top plate, assuming no framed openings, what is the total linear feet of lumber in
the wall. - ✔️✔️25x7.75= 193.75 2x32-64 64+193.75=257.75
If a header is 37-1/2' wide, what is the measurement for the rough opening? - ✔️✔️32
Calculate board feet of lumber in 12 - 2x8 floor joists that are 14' in length - ✔️✔️224
Calculagte board feet of lumber in 10 studs that are each 8' in lenght - ✔️✔️53.33
Given: 100 pounds of nails cost $35, there are 250 nails per pound. There re 80 shingles per roofing
square and 4 nails per shingle. What would be the total cost of the nails for 47 roofing squares? -
✔️✔️21.06
How mahy tread sdoes it take to get toa 9' vertical height? - ✔️✔️14 residential (7.75")
, 15 commercial (7")
How many square feet are in a sheet of 4x8 plywood? - ✔️✔️32
Given: Two walls are 96'x8' and two walls are 40'x8'. HOw many sheets of 4x8 plywood are needed
for these walls? - ✔️✔️68
The run of a building that is 50' wide - ✔️✔️25'
The run of a bulding that has a span of 64' - ✔️✔️32'
The gable height of a bulding that is 36' wide with a 4:12 slope - ✔️✔️(18x4)/12 = 6'
The gable height of a bulding that is 28' wide with a 6:12 slope - ✔️✔️14x6 = 84" & 7'
A building is 57'x39' with a hip roof and a 1" overhang will have a ridgeboard length of - ✔️✔️18
(DO NOT INCLUDE THE OVERHANG)
A 41'x41' building with a hip roof and a 2' overhang on each side will have a ridgeboard length of -
✔️✔️0 (41-41=0)
What do you put up first on a roof? - ✔️✔️Ridgeboard
What is the vertical rise of a 24' wide building with a 1/3 pitch? - ✔️✔️96"
What is the slope of a roof that has a 1/4 pitch - ✔️✔️6:12 (6x12=72)
What length material will you order for the common rafter for a building that is 38' wide with a 1'
overhang? The roof slope is 4:12 - ✔️✔️22' lumber
How many square feet is the roof of a house that is 48'x32' with a 2' over hang all the way around
and a 3:12 slope? - ✔️✔️1931
