Kal and Kara solve this problem in two different ways.
The perimeter of a rectangle is 46
46
centimeters.
Its length is 8
8
centimeters.
What is its width?
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Kal's assignment: 2 times 8 + 2 w = 46. 16 + 2 w = 46. 16 minus 16 + 2 w = 46 minus 16. 2 w = 30. w = 15. Kara's assignment: 46 minus 2 times 8. 46 minus 16 = 30. The two widths sum to 30 centimeters. 30 divided by 2 = 15. The width of the rectangle is 15 centimeters.
CLEAR CHECK
Kal's and Kara's methods use operations to simplify the expressions in order.
Kal's method uses , but Kara's method does not.