Henry Tan's answer to Lily's Primary 5 Maths Whole Numbers Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Henry Tan
Henry Tan's answer
359 answers (A Helpful Person)
1st
This is Assumption method used to solve this question, there are steps by steps video presentation from https://youtu.be/0O_nYFVeAc4 to help you to understand how to use this method. The other way to find the answer is using guess and check method.