CW 5.3 Writing Proportions

                                5.3 Writing Proportions

Lesson Objective:
● write and solve proportions
●Write equations for proportional relationships presented in tables

Starter Video

Challenge

0

Write as many as you can

Example

The last 30 seconds will explain the difference between the two questions below. 

1

Write a proportion that involves the variable from the data

1

Find the value of W

1

Write a proportion that involves the variable from the data

1

Find the number of winners in May (n)

Example

1

Solve:
(Work out the value of the variable)

1

Solve:
(Work out the value of the variable)

1

Solve:
(Work out the value of the variable)

Example

1

COMPUTERS A school requires 2 computers for every 5 students.
Write a proportion that gives the number c of computers needed for 145 students.

Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

1

COMPUTERS A school requires 2 computers for every 5 students.
Write a proportion that gives the number c of computers needed for 145 students.

SOLVE for C

1

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16
Write a proportion that gives the number s of seventh-grade swimmers.

Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

1

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16
Write a proportion that gives the number s of seventh-grade swimmers.

SOLVE for S

Example

1

Write an equation that represents this relationship.

1

Write an equation that represents this relationship.

1

Write an equation that represents this relationship.

0

Give yourself a rating on the first lesson objective

I can write and solve proportions like questions 2 to 10.

0

Give yourself a rating on the second lesson objective

I can write equations for proportional relationships presented in tables like questions 11 to 13.

5.3 Writing Proportions

Write as many as you can

Write a proportion that involves the variable from the data

Find the value of W

Write a proportion that involves the variable from the data

Find the number of winners in May (n)

Solve:(Work out the value of the variable)

Solve:(Work out the value of the variable)

Solve:(Work out the value of the variable)

COMPUTERS A school requires 2 computers for every 5 students. Write a proportion that gives the number c of computers needed for 145 students.Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

COMPUTERS A school requires 2 computers for every 5 students. Write a proportion that gives the number c of computers needed for 145 students.SOLVE for C

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16Write a proportion that gives the number s of seventh-grade swimmers.Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16Write a proportion that gives the number s of seventh-grade swimmers.SOLVE for S

Write an equation that represents this relationship.

Write an equation that represents this relationship.

Write an equation that represents this relationship.

Give yourself a rating on the first lesson objectiveI can write and solve proportions like questions 2 to 10.

Give yourself a rating on the second lesson objectiveI can write equations for proportional relationships presented in tables like questions 11 to 13.

Solve:
(Work out the value of the variable)

Solve:
(Work out the value of the variable)

Solve:
(Work out the value of the variable)

COMPUTERS A school requires 2 computers for every 5 students.
Write a proportion that gives the number c of computers needed for 145 students.

Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

COMPUTERS A school requires 2 computers for every 5 students.
Write a proportion that gives the number c of computers needed for 145 students.

SOLVE for C

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16
Write a proportion that gives the number s of seventh-grade swimmers.

Write a proportion to make sure you have the right fractions. We do not need the value of C yet.

SWIM TEAM The school team has 80 swimmers. The ratio of seventh-grade swimmers to all swimmers is 5:16
Write a proportion that gives the number s of seventh-grade swimmers.

SOLVE for S

Give yourself a rating on the first lesson objective

I can write and solve proportions like questions 2 to 10.

Give yourself a rating on the second lesson objective

I can write equations for proportional relationships presented in tables like questions 11 to 13.