Scale drawings (7th grade math)

The scale of 1:40 in a scale drawing means that 1 unit in the drawing or picture corresponds with 40 units in reality. For example, if the drawing is 5 inches long, then in reality the item is 5 × 40 in = 200 inches long.

Then we look at how a drawing drawn with a scale of 1:80 compares to the drawing drawn with the scale 1:40.

Next, I work through an exercise where we redraw a rectangle at a different scale. The original scale image is drawn at a scale of 1:500 and I redraw it at the scale of 1:800.

The last exercise asks you to redraw a house shape that is drawn at the scale of 1:20, at the scale of 1:12.

See also

Floor Plans — video lesson

Math Mammoth Grade 7 curriculum (pre-algebra)

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