WALT calculate increases and decreases WILF Calculate Increase

To find 25% Find a quarter ¼ (÷ 4 or halve & halve again

If 10% of 120 is 12: then 30% of 120 is 3 x 12,

In the shops you will often see items in the sales Everybody loves

★ - 30% off all Xbox Games! Spiderman - £ 50 FIFA 120

★ - 30% off all Xbox Games! Spiderman - £ 50 FIFA 20

a) 25%= ¼ of 600 = 150 screws. b) 600 – 150 faulty =

In the shops you will often see items with … As a shopper,

Have a go at solving … A packet of crisps contains 50 g. If

A packet of crisps contains 50 g. If the "new size" packets contain 15%

Suzy gave her sister Amy 35% of her collection of 300 stickers in exchange

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WALT: calculate % increases and decreases WILF: • • Calculate % Increase = + to original Decrease = - from original Units of measure

To find 25% Find a quarter ¼ (÷ 4 or halve & halve again ) To find 10% Divide by ten ( ÷ 10 ). To find 5% ÷ 10 and then halve ( ÷ 2) To find 1% Divide by 100 ( ÷ 100 )

If 10% of 120 is 12: then 30% of 120 is 3 x 12, So 30% = ? What about these then? 40% of 80 65% of 120 83% of 20 27% of 56

If 10% of 120 is 12: then 30% of 120 is 3 x 12, So 30% = ? What about these then? 40% of 80 = 32 65% of 120 = 78 83% of 20 = 16. 6 27% of 56 = 15. 12

In the shops you will often see items in the sales Everybody loves a sale! Why? Does this mean it will cost more or less than the original price?

In the shops you will often see items in the sales Everybody loves a sale! Why? Does this mean it will cost more or less than the original price? Less! Save money.

★ - 30% off all Xbox Games! Spiderman - £ 50 FIFA 120 - £ 42 ★ ★ - 45% off all phones! Iphone - £ 440 Samsung Galaxy - £ 360

★ - 30% off all Xbox Games! Spiderman - £ 50 FIFA 20 - £ 42 £ 50 - £ 15 = £ 35 ★ ★ - 45% off all phones! Iphone - £ 440 Samsung Galaxy - £ 360 £ 440 - £ 198 = £ 242 £ 42 - £ 12. 60 = £ 29. 40 £ 360 - £ 162 = £ 198

Have a go at solving …

a) 25%= ¼ of 600 = 150 screws. b) 600 – 150 faulty = 450 screws made each day. There are 4 lots of 450 in 1800, so it would take 4 days.

In the shops you will often see items with … As a shopper, is this good? Why? Does this mean you will have more or less than the original?

In the shops you will often see items with … As a shopper, is this good? Why? Yes because you are getting some free. Does this mean you will have more or less than the original? More.

Have a go at solving … A packet of crisps contains 50 g. If the "new size" packets contain 15% more, how many grams of crisps are in the "new size" packets?

A packet of crisps contains 50 g. If the "new size" packets contain 15% more, how many grams of crisps are in the "new size" packets? 10 % of 15 g = 1. 5 g 5% = 1. 5 g ÷ 2 = 0. 75 g 15% = 1. 5 g + 0. 75 g = 50 g + 2. 25 g = 52. 25 g

Suzy gave her sister Amy 35% of her collection of 300 stickers in exchange for her dessert. Amy added this to her collection of 176 stickers. a) How many stickers did Suzy give Amy? b) Who now has more stickers? Show your working out. a) 10% = 30 so 30% = 90 5% = ½ of 30 = 15 90 + 15 = 105 stickers b) Suzy has 300 – 105= 195 stickers. Amy has 176 + 105= 281 stickers. Amy now has more stickers.