With numbers 1 to 9, we have to make the answer 100. How? You have numbers 1,2,3,4,5,6,7,8,9. You cannot change their sequence. You can only use + or -. You can also join two or three digits but only in order. eg: 12, 23, 34, 45, 56, 67, 78, 89 etc. You cannot use a number twice. Solve it.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Here are some ways to write the number 100 using only +- or 2 digit numbers.:

1 + 2 + 3 - 4 + 5 + 6 + 78 + 9 =  100

12 + 3 -  4 + 5+ 67 + 8 + 9 = 100

1 +2 + 3 - 4+ 5 + 6 + 78 + 9 = 100

 

Approved by eNotes Editorial Team