13122021 Proportion STARTER MATHSWATCH CLIP 42 199 GRADE

13/12/2021 Proportion STARTER MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion STARTER MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion L. O. To be able to § Understand the concept of proportion § Link fractions, decimals and percentages § Use proportion to scale up or down recipes Key Words proportion, fraction, decimal, percentage, scale, unit MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7 BASIC PROPORTION

MATHSWATCH CLIP 42, 199 GRADE 2, 7 Proportion 13/12/2021 Proportion compares the size of a part to the size of a whole. There are many ways to express a proportion. For example, What proportion of these counters are red? We can express this proportion as: 12 out of 16 3 in every 4 3 4 0. 75 or 75%

Proportion Difficulty * MATHSWATCH CLIP 42, 199 GRADE 2, 7 A proportion compares a part of a quantity with the whole of it: What proportion of the bar above is blue? In Words: As a Fraction: As a Decimal: As a Percentage:

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7 A proportion compares a part of a quantity with the whole of it: What proportion of the bar above is blue? In Words: Three parts out of ten As a Fraction: 3/10 As a Decimal: 0. 3 As a Percentage: 30%

Difficulty * Proportion Task – what is the proportion of red squares in each pattern? Give your answer as a fraction 1) 2) 3) 4) 5) 6) MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 MATHSWATCH CLIP 42, 199 GRADE 2, 7 Proportion Task – what is the proportion of red squares in each pattern? Give your answer as a fraction (simplified if you can) 1) 2) 4/6 = 2/3 3/5 3) 1/7 4) 3/9 = 1/3 3/11 5) 6) 4/4 = 1/1

Difficulty ** Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7 Task – Draw some of your own patterns using 10 or 20 red and green squares. How many can you come up with? Write down the proportion of red or green squares in each pattern. Extension: Simplify your fractions, or write the proportion as a percentage. WAGOLL: The fraction of red squares is 5/20 = 1/4, which is 25%.

13/12/2021 Proportion RECIPES Check out this video to help with this section of the lesson Recipes Video – Corbettmaths www. corbettmaths. com/2013/05/16/recipes MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Recipes MATHSWATCH CLIP 39 GRADE 2 Using recipes § It’s very important that you are able to accurately scale up or down a recipe § Imagine if you want to throw a party, but you can’t make enough food for your guests because you don’t know how to change the ingredients!

13/12/2021 Recipes MATHSWATCH CLIP 39 GRADE 2 Changing a recipe § First decide how you will get from the number of people the recipe is for, to the number of people you want to cater for § If more than one step is needed, draw a table around your ingredients with blank columns for each step § Fill the columns in and work out your ingredients

MATHSWATCH CLIP 39 GRADE 2 Recipes 13/12/2021 Example § Scale up the recipe that serves 8 people so that you can serve 20 people § We can’t do this in one step so we can use a table to help We could find this… What we are aiming for… Then add it to this to get what we want For 8 people 16 people 4 people 20 people 300 ml milk 600 150 750 ml 2 eggs 4 1 5 eggs 120 g flour 240 60 300 g 5 g butter 10 2. 5 12. 5 g

MATHSWATCH CLIP 39 GRADE 2 Recipes Difficulty ** You try: Find out how much of each ingredient you will need to make a cake that serves 15 people. Victoria Sponge – Serves 10 Ingredients for 10 people 110 g butter 100 g caster sugar 2 eggs 210 g self raising flour Ingredients for 5 people Ingredients for 15 people

MATHSWATCH CLIP 39 GRADE 2 Recipes 13/12/2021 You try: Find out how much of each ingredient you will need to make a cake that serves 15 people. Victoria Sponge – Serves 10 Ingredients for 10 people Ingredients for 5 people Ingredients for 15 people 110 g butter 55 g butter 165 g butter 100 g caster sugar 50 g caster sugar 150 g caster sugar 2 eggs 1 egg 3 eggs 210 g self raising flour 105 g s/r flour 315 g s/r flour

Difficulty ** Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

Difficulty ** Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

Difficulty *** Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

Difficulty *** Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7

13/12/2021 Proportion MATHSWATCH CLIP 42, 199 GRADE 2, 7