Equal ratios/lowest terms

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Good Afternoon!

Schedule: 

• Learning goals 
• Last time
• Intro question
• Equal ratios/Lowest terms
• Work + Skittles activity

Learning goals 

At the end of this lesson I can:

• Express a ratio in lowest terms
• Identify equal ratios 
• Collaborate in an activity 

What did we do last time?

Express as a ratio in simplest form:
3 months to 1 year

Which ratios are equal (the same)?

4:10

18:12

3:6

25:35

12:24

20:50

5:7

9:6

Write as a ratio in lowest terms:
450 g of sugar to 1 kg of flour

What to do

If you: 

- Got all of them right                Quietly work on "equivalent ratios extra worksheet" on ManageBac

- Got 1 mistake                              Join the explanation and get to work after

- Got more than 1 mistake       Join the explanation and some examples

Equal ratios 

Make sure the units are the same before expressing as a ratio

3 months to 1 year

1 year = 12 months 

3:12                        1:4

Equal ratios

12:24 =                                              3:6

20:50 =                                             4:10

5:7 =                                                   25:35

9:6 =                                                   18:12

If you multiply or divide both parts of a ratio by the same number, you get an equal ratio

Equal ratios/lowest terms

(Lowest terms = simplest form)

To write in lowest terms you divide both parts of the ratio by the Highest Common Factor

450 g of sugar to 1 kg of flour                            ( 1kg = 1000 g )

450 : 1000 = 45 : 100

{HCF of 45 and 100 is        }

Work 

- 16C 16DEquivalent ratios Extra worksheet (on ManageBac) 

- When you are finished, Ratios challenging problems worksheet

- Skittles activity

Skittles activity

- Every group will get a bag of skittles. DO NOT EAT THESE. You need the skittles for the activity

- Answer the questions from the activity with your skittles

- Encourage each other to be good collaborators 

- At the end of the activity you will evaluate each group member Individually