maths
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maths
What is the easy way to answer the following questions?
Here are two ways of making a total of 12 from three different whole numbers:
2+3+7=12. 3+4+5=12
A) Write down all the ways of making a total of 12 using three different whole numbers (don't count 2+3+7 as different from 2+7+3)
B) how may ways are there of making a total of 15 using three different whole numbers
Here are two ways of making a total of 12 from three different whole numbers:
2+3+7=12. 3+4+5=12
A) Write down all the ways of making a total of 12 using three different whole numbers (don't count 2+3+7 as different from 2+7+3)
B) how may ways are there of making a total of 15 using three different whole numbers
Last edited by Apple33 on Tue Mar 17, 2015 10:40 pm, edited 1 time in total.
Re: Latymer upper example maths q23
I 'd start by thinking about two numbers that add to 12
1 + 11
now split the 11 into two numbers 1 + 2 + 9, 1 + 3 + 8, 1 + 4 + 7, 1+ 5 + 6 others are duplicates or repeat ( 1 + 1 \+ 10)
then repeat
1 + 11
now split the 11 into two numbers 1 + 2 + 9, 1 + 3 + 8, 1 + 4 + 7, 1+ 5 + 6 others are duplicates or repeat ( 1 + 1 \+ 10)
then repeat