Survey

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Survey

Document related concepts

no text concepts found

Transcript

Week 2 Maths Revision Factor : a whole number that divides exactly into another number. example 3 is a factor of 9. 4 and 5 are both factors of 20. For Common Factor : numbers that have the same factors are called ‘common factors’. For example : 2 is a common factor of 4, 8 and 14. 8 is a common factor of 24 and 40. To find common factors you need to list the factors for each number and find the factors that are in each list. Multiple : a multiple is a number made by multiplying two whole numbers greater than 1. For example 12 is a multiple of 6 as 2 x 6 = 12. 24 is a multiple of 8 because 8 x 3 = 24. Common multiple : a multiple that is shared by 2 or more numbers. For example: 12 is a common multiple of 2, 3, 4 and 6. To find common multiples you need to list the multiples of each number and find the numbers that are in each list. Equivalent fractions ¼ 0.25 25% ½ 0.5 50% ¾ 0.75 75% 1 whole 1.0 100% 1/ 5 0.2 20% 1/ 10 0.1 10% To find 10% or 1/10 of a number you need to divide the number by 10. To find 5% of a number you can find 10% and then halve the answer. For example : to find 15% of £240 you would first find 10% and then find 5%. 10% of £240 = £24. 5% of £240 = £12 15% of £240 = £24 + £12 = £36. Statistics Mean : this is the same as the ‘average’. To calculate the mean of a set of numbers you must add the numbers and then divide by how many amounts there were. For example : Day Temp Mon 60 Tues 80 Wed 70 Thurs 100 Fri 90 Sat 80 Sun 80 To find the average temperature you need to add each temperature and then divide by 7 (as there are 7 amounts). 6 + 8 + 7 + 10 + 9 + 8 + 8 = 56 56 ÷ 7 = 8 The mean (or average) temperature is 80. Mode : is the most common number. (80) Median : is the middle number : put all the numbers in ascending order and find the middle one. 6, 7, 8, 8, 8, 8, 9, 10. Median is 80.