EE.2a - Write expressions that record operations with numbers and with letters standing for numbers.
warm-up
Write the following expressions:
1) A number less than 9
2) The sum of a number and 32
3) The quotient of a number and 8
4) The product of a number and 12
Read the following expressions 2 different ways:
1) 6 – m
2) n – 9
3) 16n
4) n/6
1) A number less than 9
2) The sum of a number and 32
3) The quotient of a number and 8
4) The product of a number and 12
Read the following expressions 2 different ways:
1) 6 – m
2) n – 9
3) 16n
4) n/6
mini lesson - independent work/share out/discussion
team challenge
Rectangle Perimeter 3
Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. Eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts.
a) Write an expression for Sadie’s way of calculating the perimeter. Write an expression for Eric’s way as well.
b) Use both of the expressions to find the perimeter of a rectangle with length 30 and width 75.
c) Explain why Sadie and Eric always get the same answer, no matter what the length and width of the rectangle are.
Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. Eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts.
a) Write an expression for Sadie’s way of calculating the perimeter. Write an expression for Eric’s way as well.
b) Use both of the expressions to find the perimeter of a rectangle with length 30 and width 75.
c) Explain why Sadie and Eric always get the same answer, no matter what the length and width of the rectangle are.