Three plus 30 plus three equals what?
We’re being asked to add two threes to 30. To work out the answer in our head, we could start at 30 and count forward three two times. 30 add three is 33. 33 add three is 36. Three plus 30 plus three equals 36. We started at 30 and counted forward three two times. 30 plus three is 33, and 33 plus three equals 36.