Presentation on theme: "Problem Solving Starter - Presents"— Presentation transcript:
1Problem Solving Starter - Presents Gurmit paid £21 for five presentsFor A and B he paid a total of £6.For B and C he paid a total of £10.For c and D he paid a total of £7.For D and E he paid a total of £9.How much did Gurmit pay for each present?
2Gurmit paid £2, £4, £6, £1, and £8 for the five presents. Solution – PresentsGurmit paid £2, £4, £6, £1, and £8 for the five presents.
3Problem Solving Starter – Three Digits Don’t forget youcan onlyhave up to 9beads on eachstick!Imagine you have 25 beads.You have to make a three-digit number on an abacus.You must use all 25 beds for each number you make.How many different three-digit numbers can you make?Write them in order.
4You can make six different numbers. Solution – Three digitsYou can make six different numbers.In order, the numbers are: 799, 889, 898, 979, 988, 997.
5Problem Solving Starter – Make Five Numbers Take 10 cards numbered 0 to 9.Each time use all ten cards.Arrange the cards to make:Five numbers that are multiples of 3Five numbers that are multiples of 7Five prime numbersMake up more problems to use all ten cards to make five special numbers.
6Solution – Make Five Numbers 12, 39, 45, 60, 787, 42, 63, 98, 1055, 23, 67, 89, 401There are other solutions.
7Problem Solving Starter – Maze Start with zero.Find a route from ‘start’ to ‘end’ that totals 100Which route has the highest total?Which has the lowest total?Now try some different starting numbers.Start+ 6X 9÷ 2+ 9X 7÷ 3X 5X 5- 6X 3- 5÷ 3X 7- 8End
8Solution – MazeThere are two routes that total 100 exactly:+6 x7 -6 x3 -8 =100+9 x7 ÷3 x5 -5 =100The route giving the highest total is:+9 x7 -6 x7 -8 =391The route giving the lowest total is:+6 x7 ÷3 x3 -8 =34
9Problem Solving Starter – Eggs Mrs Choy spent exactly £10 on 100 eggs for her shop.Large eggs cost her 50p each.Medium eggs cost her 10p each.Small eggs cost her 5p each.For two of the sizes, she bought the same number of eggs.How many of each size did she buy?
10Solution – EggsMrs Choy bought:10 large eggs at 50p each10 medium eggs at 10p each80 small eggs at 5p each.
11Problem Solving Starter – Flash Harry In April Flash Harry bought a saddle for £100.In May he sold it for £200.In June he was sorry he had sold it.So he bought it back for £300.In July he got tired of it.So he sold it for £400.Overall, did Flash Harry make or lose money?How much did he make or lose?
12Solution – Flash HarryFlash Harry’s bank balance looked like this:April - £100May + £100June - £200July + £200So Harry made £200 overall.
13Problem Solving Starter – Age old Problems My age this year is a multiple of 8.Next year it will be a multiple of 7.How old am I?2. Last year my age was a square number.Next year it will be a cube number.How long must I wait until my age is both a square number and a cube?My mum was 27 when I was born. * years ago she was twice as old as I shall be in 5 years’ time.How old am I now?
14Solution – Age old Problems I am 48 years old (or possibly 104)2. I am now 26 years old. In 38 years’ time, when I am 64, my age will be both a square number and a cube.I am 9 years old now.
15Problem Solving Starter – Zids and Zods Zids have 4 spots.Zods have 9 spots.Altogether some Zids and Zods have 48 spots.How many Zids are there?How many Zods?What if Zids have 5 spots, Zods have 7 spots, and there are 140 spots together?Find as many solutions as you can.
16Problem Solving Solution – Zids and Zods There are 3 Zids with 4 spots and 4 Zods with 9 spots.If Zids have 5 spots and Zods have 7 spots, the possible ways of making 140 are:28 Zids;21 Zids and 5 Zods;14 Zids and 10 Zods;1 Zids and 15 Zods;20 Zods.