Architect’s Scale

Standard Students will demonstrate the ability to read and draw using the proper scale.

Never, Never Rules Never draw a line using the edge of the scale Never mark on the scale Never hit the scale on anything Never touch the compass to the scale

Full Size – 16 Side of the Architect’s Scale 2” = 2” Every line equals 1/16” Start by finding the whole number on the scale and then find the fraction

Full Size Practice - measuring lines full size 1 2 3 4

Half Size – 16 Side of the Architect’s Scale Can this drawing be created full size if typical paper is 8-1/2” x 11”?

Half Size – 16 Side of the Architect’s Scale Measure/Multiply: When measuring a line, double the measurement you find to get the actual dimension Half Size – 16 Side of the Architect’s Scale

Half Size – 16 Side of the Architect’s Scale Measure/Multiply: When measuring a line, double the measurement you find to get the actual dimension 4 ¾ = 8 3/2 = 9 ½ Leave Double ÷ 2 It does not matter if the whole number is even or odd!! You multiply x 2 the same way for all mixed numbers!!

Half Size – 16 Side of the Architect’s Scale Measure/Multiply: When measuring a line, double the measurement you find to get the actual dimension Measurement Actual Dimension X2 1-1/2” 2-3/4” 6-7/8”

Half Size – 16 Side of the Architect’s Scale Measure/Multiply: When measuring a line, double the measurement you find to get the actual dimension Measurement Actual Dimension X2 1-1/2” 3” 2-3/4” 5-1/2” 6-7/8” 13-3/4”

Practice problems for measuring a line half size – multiply by 2 1) 3-3/4 x 2 = 7-1/2 2) 5-1/2 x 2 = 11 3) 4-5/8 x 2 = 9-1/4 4) 6-1/4 x 2 = 12-1/2 5) 7-3/8 x 2 = 14-3/4

Half Size – 16 Side of the Architect’s Scale Draw/Divide: When marking/drawing a line, divide the actual dimension by 2 before you draw Half Size – 16 Side of the Architect’s Scale

Half Size – 16 Side of the Architect’s Scale Draw/Divide: When marking/drawing a line, divide the actual dimension by 2 before you draw Half Size – 16 Side of the Architect’s Scale

Half Size – 16 Side of the Architect’s Scale Draw/Divide: When marking/drawing a line, divide the actual dimension by 2 before you draw Actual Dimension Length of Line you Draw ÷2 1-1/2” 2-3/4” 6-7/8”

Half Size – 16 Side of the Architect’s Scale Draw/Divide: When marking/drawing a line, divide the actual dimension by 2 before you draw Actual Dimension Length of Line you Draw ÷2 1-1/2” 3/4” 2-3/4” 1-3/8” 6-7/8” 3-7/16”

Practice problems for drawing a line half size – divide by 2 1) 5-3/4 ÷ 2 = 2-7/8 2) 3-1/16 ÷ 2 = 1-17/32 3) 2-1/2 ÷ 2 = 1-1/4 4) 4-7/8 ÷ 2 = 2-7/16 5) 7-1/4 ÷ 2 = 3-5/8 6) 9-3/8 ÷ 2 = 4-11/16

Half Size Practice - measuring lines half size 1 2 3 4

Fraction Tips for Half Size Measurements Multiplication of Mixed Numbers by Two (4-5/8 x 2): Multiply whole number by two, leave the numerator, divide the denominator by two – SIMPLIFY if needed Division of Fractions by Two (3/4 ÷ 2): Leave the numerator and double the denominator Division of Mixed Numbers by Two when the Whole Number is EVEN (2-7/8÷2): Divide the whole number by two, then leave the numerator and double the denominator Division of Mixed Numbers by Two when the Whole Number is ODD (3-1/2÷2): Divide the whole number by two and write down only the whole number, add the numerator and the denominator to get new numerator, then double the denominator

Architect’s scale Sheet 1 – full size Helpful hints: Measure from the outside edge of right line to outside edge of left line Name, date and seat number – should be LETTERED

Architect’s scale Sheet 2 – full size Name, date and class period – should be LETTERED Label each tick mark (1/16, 1/8, 3/16, etc.)

Architect’s scale Sheet 3 – half size Measure the line and then multiply the distance by 2 and record answer MEASURE - MULTIPLY Divide the distance by 2 before drawing a tick mark and make a mark that distance DRAW - DIVIDE

Architect’s scale Sheet 4 – half size DRAW - DIVIDE Divide the distance by 2 before drawing a tick mark and make a mark that distance

Test Review – 4 never, never rules Never draw a line using the edge of the scale Never mark on the scale Never hit the scale on anything Never touch the compass to the scale

Test Review – Length of shaded box – FULL SIZE 7-5/8 8-3/16

Test Review – Draw lines based on a measurement – FULL SIZE 3-7/8 1-5/16

Test Review – measure lines and record length – FULL SIZE 3-1/4 13/16

Test Review – Draw lines based on a measurement – half SIZE draw - divide 4-7/8 3-3/4 4-7/8 ÷ 2 = 2-7/16 3-3/4 ÷ 2 = 1-7/8

Test Review – measure lines and record length – half SIZE Measure - multiply 5-7/8 2-1/4 2-15/16 x 2 = 4-15/8 = 5-7/8 1-1/8 x 2 = 2-1/4

Test If, when measuring, the end falls in between two numbers, pick the one it is closest to – I WILL ACCEPT BOTH ANSWERS When done with the test, turn it in and work on your homework for next week.