Do any numbers go into 261?

Answer 1

When testing for numbers that 'go into' Test wi the Prime Numbers:-

#1; Is it an even number . In thisd case No. so discoiunt '2'

#2; Does it end in '5' or '10' . In this case NO so discount '5'

#3 ; Do the digits add to '9' . In this case YES 2+6+1 = 9 , so it will divide by '9'.

#4 ; '3' & '7' are the only other two possibilites, however, they will be manually tested.

Hence

261/9 = 29

261/ 3 = 87

261/7 = 37. remainder '2' So '7' DOESN'T Go

Hence '3' & '9' will go into 261.

The other unique number is '11' . e.g. 132 . To test if the middle number add to the sum of the outside numbers , in this 1 + 2 = 3 the it will divide by '11'

Try 143 , or 275

Answer 2

None except for 1, 3, 9, 29, 87, and 261.

Answer 3

yes