Then let them work out the problem individually and compare answers. You can walk around the room and look at what they are writing to see who understands the concept. It also keeps kids from adopting the attitude that they will just sit back and let their partner to all the thinking. The partner gives a thumbs-up to show agreement, or corrects the spelling. You can reveal the correct spelling by uncovering the word from a chart.
Students become actively involved in thinking about the concepts presented in the lesson.
When teachers present too much information all at once, much of that information is lost. When students talk over new ideas, they are forced to make sense of those new ideas in terms of their prior knowledge. Students are more willing to participate since they don't feel the peer pressure involved in responding in front of the whole class.