Hustrative Mathematics
Lesson 1: A Different kind of Change
Cool Down: 100 Meters of Fencing
A rectangular yard is enclosed by 100 meters of fencing. The table shows some possible
values for the length and width of the yard.
length (meters) width (meters) area (square meters)
10
40
400
20
30
25
25
625
35
15
525
40
1. Complete the table with the missing values.
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An electronics manufacturer wants to know if customers would be interested in a detachable keyboard for their tables and if so, what the most important features would be. the manufacturer partners with an electronics store to include copies of the survey with every purchase at that store for one week. which of the following best explains why this random sample is unlikely to be a good representative sample of tablet owners' preferences for a detachable keyboard? a) one week is likely not enough time to get a large enough sample. b) most people won't bother to send in the survey, which is likely to skew the results c) there is no way to verify whether the responders to the survey actually own a tablet d) the survey is biased because it was conducted through an electronics store, not the general population

For what is the measure of the angle at the top of the shed? a. multiplication of areas b. squaring of areas c. addition of areas d. division of areas

Sandy is ordering bread rolls for her party,she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.