55 and its multiples.
1, 5, and 55 are all in both the 5 times and 11 times tables.
the numbers in the 4 times tables up to 12 are: 4,8,12,16,20,24,28,32,36,40,44, and 48the numbers in the 5 times tables up to 12 are:5,10,15,20,25,30,35,40,45,50,55, and 60
all of the numbers in the 15 times tables and 3 and 5
15, 30, 45, 60 and so on.
The secret to working out your 11 times tables from 10 to 99 is this: Separate the number like this: 11x45=495 4 5 Add the numbers together 11x45=495 4+5=9 Put the added number in between the first ones 495 And theirs your answer!
I can find 13 ways, not just 7, to make 60 from adding numbers in the 4, 5 and 9 times tables.
Because certain times tables always end in particular numbers. The numbers in the 10 times tables always end with a 0 e.g 10, 20, 30... The number in the 5 times tables always end with a 0 or 5 e.g. 5, 10, 15... The 2, 4, 6, 8 times tables will always end in even numbers. The 1 times table is obvious. The 9 times table always has digits that sum to 9 e.g. 9, 18, 27... The hardest times table is usually considered to be the 7 times table to learn as their is no obvious pattern to the numbers.
Work It Out By Drawing A Grid, Eliminate the 2 Times Tables, Then 3, Then 5, Then 7, Then 11, Then 13, And All The Primes, And Your Be Left With The Higher Prime Numbers :D
5 x 5 x 11
11x5
5 and 11
A way to do this is to spot any obvious prime factors. In this case, 275 ends in a 5 and so is divisible by 5. Doing that gives 275/5 = 55. This is now clearly the product of 5 and 11, from times tables. Thus 275 as a product of prime numbers is 5x5x11
They are: 3 5 and 11