Because that is how addition is defined.
One lot of tens and no units added to one lot of tens and no units makes two lots of tens and no units.
Chat with our AI personalities
10 plus 20-2 - 11 plus 3 is equal to 20.
It is an arithmetical statement.
your answer is 20 ( 10+5=15+5=20)
11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
Yes.